diff --git a/deps/v8/include/v8-debug.h b/deps/v8/include/v8-debug.h
index e41df29ad053c7..50314501e3b3b9 100644
--- a/deps/v8/include/v8-debug.h
+++ b/deps/v8/include/v8-debug.h
@@ -18,11 +18,13 @@ enum DebugEvent {
   Exception = 2,
   NewFunction = 3,
   BeforeCompile = 4,
-  AfterCompile = 5,
+  AfterCompile  = 5,
   CompileError = 6,
-  AsyncTaskEvent = 7,
+  PromiseEvent = 7,
+  AsyncTaskEvent = 8,
 };
 
+
 class V8_EXPORT Debug {
  public:
   /**
diff --git a/deps/v8/include/v8-platform.h b/deps/v8/include/v8-platform.h
index 4023a5b234fd4b..11f8d51f02573e 100644
--- a/deps/v8/include/v8-platform.h
+++ b/deps/v8/include/v8-platform.h
@@ -152,9 +152,9 @@ class Platform {
    */
   virtual uint64_t AddTraceEvent(
       char phase, const uint8_t* category_enabled_flag, const char* name,
-      const char* scope, uint64_t id, uint64_t bind_id, int32_t num_args,
-      const char** arg_names, const uint8_t* arg_types,
-      const uint64_t* arg_values, unsigned int flags) {
+      uint64_t id, uint64_t bind_id, int32_t num_args, const char** arg_names,
+      const uint8_t* arg_types, const uint64_t* arg_values,
+      unsigned int flags) {
     return 0;
   }
 
diff --git a/deps/v8/include/v8.h b/deps/v8/include/v8.h
index 703a4f4f4ad575..ad2e5f60c2a68a 100644
--- a/deps/v8/include/v8.h
+++ b/deps/v8/include/v8.h
@@ -5212,8 +5212,8 @@ class V8_EXPORT HeapStatistics {
   size_t total_available_size_;
   size_t used_heap_size_;
   size_t heap_size_limit_;
-  size_t malloced_memory_;
   bool does_zap_garbage_;
+  size_t malloced_memory_;
 
   friend class V8;
   friend class Isolate;
@@ -7330,7 +7330,7 @@ class Internals {
       1 * kApiPointerSize + kApiIntSize;
   static const int kStringResourceOffset = 3 * kApiPointerSize;
 
-  static const int kOddballKindOffset = 5 * kApiPointerSize;
+  static const int kOddballKindOffset = 4 * kApiPointerSize;
   static const int kForeignAddressOffset = kApiPointerSize;
   static const int kJSObjectHeaderSize = 3 * kApiPointerSize;
   static const int kFixedArrayHeaderSize = 2 * kApiPointerSize;
@@ -7349,12 +7349,12 @@ class Internals {
   static const int kIsolateRootsOffset =
       kAmountOfExternalAllocatedMemoryAtLastGlobalGCOffset + kApiInt64Size +
       kApiPointerSize;
-  static const int kUndefinedValueRootIndex = 4;
-  static const int kTheHoleValueRootIndex = 5;
-  static const int kNullValueRootIndex = 6;
-  static const int kTrueValueRootIndex = 7;
-  static const int kFalseValueRootIndex = 8;
-  static const int kEmptyStringRootIndex = 9;
+  static const int kUndefinedValueRootIndex = 5;
+  static const int kNullValueRootIndex = 7;
+  static const int kTrueValueRootIndex = 8;
+  static const int kFalseValueRootIndex = 9;
+  static const int kEmptyStringRootIndex = 10;
+  static const int kTheHoleValueRootIndex = 11;
 
   // The external allocation limit should be below 256 MB on all architectures
   // to avoid that resource-constrained embedders run low on memory.
@@ -7370,7 +7370,7 @@ class Internals {
   static const int kNodeIsPartiallyDependentShift = 4;
   static const int kNodeIsActiveShift = 4;
 
-  static const int kJSObjectType = 0xb8;
+  static const int kJSObjectType = 0xb5;
   static const int kFirstNonstringType = 0x80;
   static const int kOddballType = 0x83;
   static const int kForeignType = 0x87;
diff --git a/deps/v8/src/api.cc b/deps/v8/src/api.cc
index 5d326981cd6320..dc954d3f143595 100644
--- a/deps/v8/src/api.cc
+++ b/deps/v8/src/api.cc
@@ -5526,8 +5526,8 @@ HeapStatistics::HeapStatistics()
       total_available_size_(0),
       used_heap_size_(0),
       heap_size_limit_(0),
-      malloced_memory_(0),
-      does_zap_garbage_(0) {}
+      does_zap_garbage_(0),
+      malloced_memory_(0) {}
 
 HeapSpaceStatistics::HeapSpaceStatistics(): space_name_(0),
                                             space_size_(0),
diff --git a/deps/v8/src/builtins.cc b/deps/v8/src/builtins.cc
index 9c3ff5956b29d7..1ad19946cb0acd 100644
--- a/deps/v8/src/builtins.cc
+++ b/deps/v8/src/builtins.cc
@@ -223,7 +223,8 @@ inline bool PrototypeHasNoElements(Isolate* isolate, JSObject* object) {
   HeapObject* empty = isolate->heap()->empty_fixed_array();
   while (prototype != null) {
     Map* map = prototype->map();
-    if (map->instance_type() <= LAST_CUSTOM_ELEMENTS_RECEIVER) return false;
+    if (map->instance_type() <= LAST_CUSTOM_ELEMENTS_RECEIVER ||
+        map->instance_type() == JS_GLOBAL_PROXY_TYPE) return false;
     if (JSObject::cast(prototype)->elements() != empty) return false;
     prototype = HeapObject::cast(map->prototype());
   }
@@ -237,6 +238,7 @@ inline bool IsJSArrayFastElementMovingAllowed(Isolate* isolate,
 
 inline bool HasSimpleElements(JSObject* current) {
   return current->map()->instance_type() > LAST_CUSTOM_ELEMENTS_RECEIVER &&
+         current->map()->instance_type() != JS_GLOBAL_PROXY_TYPE &&
          !current->GetElementsAccessor()->HasAccessors(current);
 }
 
@@ -421,9 +423,13 @@ void Builtins::Generate_ObjectHasOwnProperty(
 
   {
     Label if_objectissimple(assembler);
-    assembler->Branch(assembler->Int32LessThanOrEqual(
-                          instance_type,
-                          assembler->Int32Constant(LAST_SPECIAL_RECEIVER_TYPE)),
+    assembler->Branch(assembler->Word32Or(
+                          assembler->Int32LessThanOrEqual(
+                              instance_type, assembler->Int32Constant(
+                                             LAST_SPECIAL_RECEIVER_TYPE)),
+                          assembler->Word32Equal(
+                              instance_type, assembler->Int32Constant(
+                                             JS_GLOBAL_PROXY_TYPE))),
                       &call_runtime, &if_objectissimple);
     assembler->Bind(&if_objectissimple);
   }
@@ -481,9 +487,13 @@ void Builtins::Generate_ObjectHasOwnProperty(
   assembler->Bind(&keyisindex);
   {
     Label if_objectissimple(assembler);
-    assembler->Branch(assembler->Int32LessThanOrEqual(
-                          instance_type, assembler->Int32Constant(
+    assembler->Branch(assembler->Word32Or(
+                          assembler->Int32LessThanOrEqual(
+                              instance_type, assembler->Int32Constant(
                                              LAST_CUSTOM_ELEMENTS_RECEIVER)),
+                          assembler->Word32Equal(
+                              instance_type, assembler->Int32Constant(
+                                             JS_GLOBAL_PROXY_TYPE))),
                       &call_runtime, &if_objectissimple);
     assembler->Bind(&if_objectissimple);
   }
diff --git a/deps/v8/src/code-stubs-hydrogen.cc b/deps/v8/src/code-stubs-hydrogen.cc
index 1d2fb811fbb2c2..c08be58945837b 100644
--- a/deps/v8/src/code-stubs-hydrogen.cc
+++ b/deps/v8/src/code-stubs-hydrogen.cc
@@ -923,6 +923,9 @@ HValue* CodeStubGraphBuilder<FastArrayPushStub>::BuildCodeStub() {
     check_instance_type.If<HCompareNumericAndBranch>(
         instance_type, Add<HConstant>(LAST_CUSTOM_ELEMENTS_RECEIVER),
         Token::LTE);
+    check_instance_type.Or();
+    check_instance_type.If<HCompareNumericAndBranch>(
+        instance_type, Add<HConstant>(JS_GLOBAL_PROXY_TYPE), Token::EQ);
     check_instance_type.ThenDeopt(Deoptimizer::kFastArrayPushFailed);
     check_instance_type.End();
 
diff --git a/deps/v8/src/d8.cc b/deps/v8/src/d8.cc
index 06883803f90091..967d1e4fd43c62 100644
--- a/deps/v8/src/d8.cc
+++ b/deps/v8/src/d8.cc
@@ -133,7 +133,7 @@ class PredictablePlatform : public Platform {
   }
 
   uint64_t AddTraceEvent(char phase, const uint8_t* categoryEnabledFlag,
-                         const char* name, const char* scope, uint64_t id,
+                         const char* name, uint64_t id,
                          uint64_t bind_id, int numArgs, const char** argNames,
                          const uint8_t* argTypes, const uint64_t* argValues,
                          unsigned int flags) override {
diff --git a/deps/v8/src/debug/debug.cc b/deps/v8/src/debug/debug.cc
index 6e9401257967cd..7c76742bb973cb 100644
--- a/deps/v8/src/debug/debug.cc
+++ b/deps/v8/src/debug/debug.cc
@@ -1708,6 +1708,13 @@ MaybeHandle<Object> Debug::MakeCompileEvent(Handle<Script> script,
 }
 
 
+MaybeHandle<Object> Debug::MakePromiseEvent(Handle<JSObject> event_data) {
+  // Create the promise event object.
+  Handle<Object> argv[] = { event_data };
+  return CallFunction("MakePromiseEvent", arraysize(argv), argv);
+}
+
+
 MaybeHandle<Object> Debug::MakeAsyncTaskEvent(Handle<JSObject> task_event) {
   // Create the async task event object.
   Handle<Object> argv[] = { task_event };
@@ -1838,6 +1845,25 @@ void Debug::OnAfterCompile(Handle<Script> script) {
 }
 
 
+void Debug::OnPromiseEvent(Handle<JSObject> data) {
+  if (in_debug_scope() || ignore_events()) return;
+
+  HandleScope scope(isolate_);
+  DebugScope debug_scope(this);
+  if (debug_scope.failed()) return;
+
+  // Create the script collected state object.
+  Handle<Object> event_data;
+  // Bail out and don't call debugger if exception.
+  if (!MakePromiseEvent(data).ToHandle(&event_data)) return;
+
+  // Process debug event.
+  ProcessDebugEvent(v8::PromiseEvent,
+                    Handle<JSObject>::cast(event_data),
+                    true);
+}
+
+
 void Debug::OnAsyncTaskEvent(Handle<JSObject> data) {
   if (in_debug_scope() || ignore_events()) return;
 
@@ -1987,6 +2013,7 @@ void Debug::NotifyMessageHandler(v8::DebugEvent event,
     case v8::NewFunction:
     case v8::BeforeCompile:
     case v8::CompileError:
+    case v8::PromiseEvent:
     case v8::AsyncTaskEvent:
       break;
     case v8::Exception:
diff --git a/deps/v8/src/debug/debug.h b/deps/v8/src/debug/debug.h
index 501de631814f5b..35aa8db049624e 100644
--- a/deps/v8/src/debug/debug.h
+++ b/deps/v8/src/debug/debug.h
@@ -417,6 +417,7 @@ class Debug {
   void OnCompileError(Handle<Script> script);
   void OnBeforeCompile(Handle<Script> script);
   void OnAfterCompile(Handle<Script> script);
+  void OnPromiseEvent(Handle<JSObject> data);
   void OnAsyncTaskEvent(Handle<JSObject> data);
 
   // API facing.
@@ -579,6 +580,8 @@ class Debug {
       Handle<Object> promise);
   MUST_USE_RESULT MaybeHandle<Object> MakeCompileEvent(
       Handle<Script> script, v8::DebugEvent type);
+  MUST_USE_RESULT MaybeHandle<Object> MakePromiseEvent(
+      Handle<JSObject> promise_event);
   MUST_USE_RESULT MaybeHandle<Object> MakeAsyncTaskEvent(
       Handle<JSObject> task_event);
 
diff --git a/deps/v8/src/debug/debug.js b/deps/v8/src/debug/debug.js
index 7f06ca1be15e15..6849bf534506b7 100644
--- a/deps/v8/src/debug/debug.js
+++ b/deps/v8/src/debug/debug.js
@@ -51,7 +51,8 @@ Debug.DebugEvent = { Break: 1,
                      BeforeCompile: 4,
                      AfterCompile: 5,
                      CompileError: 6,
-                     AsyncTaskEvent: 7 };
+                     PromiseEvent: 7,
+                     AsyncTaskEvent: 8 };
 
 // Types of exceptions that can be broken upon.
 Debug.ExceptionBreak = { Caught : 0,
@@ -1140,6 +1141,39 @@ function MakeScriptObject_(script, include_source) {
 }
 
 
+function MakePromiseEvent(event_data) {
+  return new PromiseEvent(event_data);
+}
+
+
+function PromiseEvent(event_data) {
+  this.promise_ = event_data.promise;
+  this.parentPromise_ = event_data.parentPromise;
+  this.status_ = event_data.status;
+  this.value_ = event_data.value;
+}
+
+
+PromiseEvent.prototype.promise = function() {
+  return MakeMirror(this.promise_);
+}
+
+
+PromiseEvent.prototype.parentPromise = function() {
+  return MakeMirror(this.parentPromise_);
+}
+
+
+PromiseEvent.prototype.status = function() {
+  return this.status_;
+}
+
+
+PromiseEvent.prototype.value = function() {
+  return MakeMirror(this.value_);
+}
+
+
 function MakeAsyncTaskEvent(event_data) {
   return new AsyncTaskEvent(event_data);
 }
@@ -2483,6 +2517,7 @@ utils.InstallFunctions(utils, DONT_ENUM, [
   "MakeExceptionEvent", MakeExceptionEvent,
   "MakeBreakEvent", MakeBreakEvent,
   "MakeCompileEvent", MakeCompileEvent,
+  "MakePromiseEvent", MakePromiseEvent,
   "MakeAsyncTaskEvent", MakeAsyncTaskEvent,
   "IsBreakPointTriggered", IsBreakPointTriggered,
   "UpdateScriptBreakPoints", UpdateScriptBreakPoints,
diff --git a/deps/v8/src/heap/heap.h b/deps/v8/src/heap/heap.h
index 77c10b24d2abe6..bbe1f05e4f2659 100644
--- a/deps/v8/src/heap/heap.h
+++ b/deps/v8/src/heap/heap.h
@@ -33,14 +33,14 @@ using v8::MemoryPressureLevel;
   V(Map, one_pointer_filler_map, OnePointerFillerMap)                          \
   V(Map, two_pointer_filler_map, TwoPointerFillerMap)                          \
   /* Cluster the most popular ones in a few cache lines here at the top.    */ \
+  V(Oddball, uninitialized_value, UninitializedValue)                          \
   V(Oddball, undefined_value, UndefinedValue)                                  \
-  V(Oddball, the_hole_value, TheHoleValue)                                     \
+  V(Map, cell_map, CellMap)                                                    \
   V(Oddball, null_value, NullValue)                                            \
   V(Oddball, true_value, TrueValue)                                            \
   V(Oddball, false_value, FalseValue)                                          \
   V(String, empty_string, empty_string)                                        \
-  V(Oddball, uninitialized_value, UninitializedValue)                          \
-  V(Map, cell_map, CellMap)                                                    \
+  V(Oddball, the_hole_value, TheHoleValue)                                     \
   V(Map, global_property_cell_map, GlobalPropertyCellMap)                      \
   V(Map, shared_function_info_map, SharedFunctionInfoMap)                      \
   V(Map, meta_map, MetaMap)                                                    \
diff --git a/deps/v8/src/js/promise.js b/deps/v8/src/js/promise.js
index bcf826a10151d4..201a06ca0898e0 100644
--- a/deps/v8/src/js/promise.js
+++ b/deps/v8/src/js/promise.js
@@ -89,6 +89,9 @@ function PromiseSet(promise, status, value, onResolve, onReject) {
   SET_PRIVATE(promise, promiseValueSymbol, value);
   SET_PRIVATE(promise, promiseOnResolveSymbol, onResolve);
   SET_PRIVATE(promise, promiseOnRejectSymbol, onReject);
+  if (DEBUG_IS_ACTIVE) {
+    %DebugPromiseEvent({ promise: promise, status: status, value: value });
+  }
   return promise;
 }
 
@@ -303,6 +306,9 @@ function PromiseThen(onResolve, onReject) {
   }
   // Mark this promise as having handler.
   SET_PRIVATE(this, promiseHasHandlerSymbol, true);
+  if (DEBUG_IS_ACTIVE) {
+    %DebugPromiseEvent({ promise: deferred.promise, parentPromise: this });
+  }
   return deferred.promise;
 }
 
diff --git a/deps/v8/src/keys.cc b/deps/v8/src/keys.cc
index f8b606ca4bf1cd..86456816927a30 100644
--- a/deps/v8/src/keys.cc
+++ b/deps/v8/src/keys.cc
@@ -406,7 +406,8 @@ MaybeHandle<FixedArray> GetOwnKeysWithUninitializedEnumCache(
 }
 
 bool OnlyHasSimpleProperties(Map* map) {
-  return map->instance_type() > LAST_CUSTOM_ELEMENTS_RECEIVER;
+  return map->instance_type() > LAST_CUSTOM_ELEMENTS_RECEIVER &&
+    map->instance_type() != JS_GLOBAL_PROXY_TYPE;
 }
 
 }  // namespace
diff --git a/deps/v8/src/libplatform/default-platform.cc b/deps/v8/src/libplatform/default-platform.cc
index 71ee6bee980372..6035c9d91ea833 100644
--- a/deps/v8/src/libplatform/default-platform.cc
+++ b/deps/v8/src/libplatform/default-platform.cc
@@ -170,7 +170,7 @@ double DefaultPlatform::MonotonicallyIncreasingTime() {
 
 uint64_t DefaultPlatform::AddTraceEvent(
     char phase, const uint8_t* category_enabled_flag, const char* name,
-    const char* scope, uint64_t id, uint64_t bind_id, int num_args,
+    uint64_t id, uint64_t bind_id, int num_args,
     const char** arg_names, const uint8_t* arg_types,
     const uint64_t* arg_values, unsigned int flags) {
   return 0;
diff --git a/deps/v8/src/libplatform/default-platform.h b/deps/v8/src/libplatform/default-platform.h
index ea39abc28bd4c3..fe214c69633388 100644
--- a/deps/v8/src/libplatform/default-platform.h
+++ b/deps/v8/src/libplatform/default-platform.h
@@ -47,7 +47,7 @@ class DefaultPlatform : public Platform {
   const char* GetCategoryGroupName(
       const uint8_t* category_enabled_flag) override;
   uint64_t AddTraceEvent(char phase, const uint8_t* category_enabled_flag,
-                         const char* name, const char* scope, uint64_t id,
+                         const char* name, uint64_t id,
                          uint64_t bind_id, int32_t num_args,
                          const char** arg_names, const uint8_t* arg_types,
                          const uint64_t* arg_values,
diff --git a/deps/v8/src/lookup.cc b/deps/v8/src/lookup.cc
index 3df8752c01a710..713ea069487d4f 100644
--- a/deps/v8/src/lookup.cc
+++ b/deps/v8/src/lookup.cc
@@ -74,7 +74,8 @@ void LookupIterator::Next() {
   JSReceiver* holder = *holder_;
   Map* map = holder->map();
 
-  if (map->instance_type() <= LAST_SPECIAL_RECEIVER_TYPE) {
+  if (map->instance_type() <= LAST_SPECIAL_RECEIVER_TYPE ||
+      map->instance_type() == JS_GLOBAL_PROXY_TYPE) {
     state_ = IsElement() ? LookupInSpecialHolder<true>(map, holder)
                          : LookupInSpecialHolder<false>(map, holder);
     if (IsFound()) return;
diff --git a/deps/v8/src/lookup.h b/deps/v8/src/lookup.h
index 8005f32eb95766..abd073284d4a82 100644
--- a/deps/v8/src/lookup.h
+++ b/deps/v8/src/lookup.h
@@ -289,7 +289,8 @@ class LookupIterator final BASE_EMBEDDED {
   void NextInternal(Map* map, JSReceiver* holder);
   template <bool is_element>
   inline State LookupInHolder(Map* map, JSReceiver* holder) {
-    return map->instance_type() <= LAST_SPECIAL_RECEIVER_TYPE
+    return (map->instance_type() <= LAST_SPECIAL_RECEIVER_TYPE ||
+            map->instance_type() == JS_GLOBAL_PROXY_TYPE)
                ? LookupInSpecialHolder<is_element>(map, holder)
                : LookupInRegularHolder<is_element>(map, holder);
   }
diff --git a/deps/v8/src/objects.cc b/deps/v8/src/objects.cc
index 1a82c3c07ba980..00bb16e30759ad 100644
--- a/deps/v8/src/objects.cc
+++ b/deps/v8/src/objects.cc
@@ -8371,7 +8371,8 @@ bool Map::OnlyHasSimpleProperties() {
   // Wrapped string elements aren't explicitly stored in the elements backing
   // store, but are loaded indirectly from the underlying string.
   return !IsStringWrapperElementsKind(elements_kind()) &&
-         instance_type() > LAST_SPECIAL_RECEIVER_TYPE &&
+         (instance_type() > LAST_SPECIAL_RECEIVER_TYPE &&
+         instance_type() != JS_GLOBAL_PROXY_TYPE) &&
          !has_hidden_prototype() && !is_dictionary_map();
 }
 
diff --git a/deps/v8/src/objects.h b/deps/v8/src/objects.h
index cbc9c04cddb75d..269435c282d9da 100644
--- a/deps/v8/src/objects.h
+++ b/deps/v8/src/objects.h
@@ -707,13 +707,13 @@ enum InstanceType {
   // compares for checking the JS_RECEIVER and the NONCALLABLE_JS_OBJECT range.
   JS_PROXY_TYPE,          // FIRST_JS_RECEIVER_TYPE
   JS_GLOBAL_OBJECT_TYPE,  // FIRST_JS_OBJECT_TYPE
-  JS_GLOBAL_PROXY_TYPE,
   // Like JS_OBJECT_TYPE, but requires access checks and/or has interceptors.
   JS_SPECIAL_API_OBJECT_TYPE,  // LAST_SPECIAL_RECEIVER_TYPE
   JS_VALUE_TYPE,               // LAST_CUSTOM_ELEMENTS_RECEIVER
+  JS_OBJECT_TYPE,
+  JS_GLOBAL_PROXY_TYPE,
   JS_MESSAGE_OBJECT_TYPE,
   JS_DATE_TYPE,
-  JS_OBJECT_TYPE,
   JS_CONTEXT_EXTENSION_OBJECT_TYPE,
   JS_GENERATOR_OBJECT_TYPE,
   JS_MODULE_TYPE,
@@ -9621,9 +9621,9 @@ class Oddball: public HeapObject {
   static const int kToStringOffset = HeapObject::kHeaderSize;
   static const int kToNumberOffset = kToStringOffset + kPointerSize;
   static const int kToBooleanOffset = kToNumberOffset + kPointerSize;
-  static const int kTypeOfOffset = kToBooleanOffset + kPointerSize;
-  static const int kKindOffset = kTypeOfOffset + kPointerSize;
-  static const int kSize = kKindOffset + kPointerSize;
+  static const int kKindOffset = kToBooleanOffset + kPointerSize;
+  static const int kTypeOfOffset = kKindOffset + kPointerSize;
+  static const int kSize = kTypeOfOffset + kPointerSize;
 
   static const byte kFalse = 0;
   static const byte kTrue = 1;
diff --git a/deps/v8/src/runtime/runtime-debug.cc b/deps/v8/src/runtime/runtime-debug.cc
index ad8375a8d48225..3263a89809c447 100644
--- a/deps/v8/src/runtime/runtime-debug.cc
+++ b/deps/v8/src/runtime/runtime-debug.cc
@@ -1635,6 +1635,15 @@ RUNTIME_FUNCTION(Runtime_DebugPopPromise) {
 }
 
 
+RUNTIME_FUNCTION(Runtime_DebugPromiseEvent) {
+  DCHECK(args.length() == 1);
+  HandleScope scope(isolate);
+  CONVERT_ARG_HANDLE_CHECKED(JSObject, data, 0);
+  isolate->debug()->OnPromiseEvent(data);
+  return isolate->heap()->undefined_value();
+}
+
+
 RUNTIME_FUNCTION(Runtime_DebugAsyncTaskEvent) {
   DCHECK(args.length() == 1);
   HandleScope scope(isolate);
diff --git a/deps/v8/src/runtime/runtime.h b/deps/v8/src/runtime/runtime.h
index dc1678bb73e4ed..704145462be46e 100644
--- a/deps/v8/src/runtime/runtime.h
+++ b/deps/v8/src/runtime/runtime.h
@@ -190,6 +190,7 @@ namespace internal {
   F(DebugPrepareStepInIfStepping, 1, 1)        \
   F(DebugPushPromise, 2, 1)                    \
   F(DebugPopPromise, 0, 1)                     \
+  F(DebugPromiseEvent, 1, 1)                   \
   F(DebugAsyncTaskEvent, 1, 1)                 \
   F(DebugIsActive, 0, 1)                       \
   F(DebugBreakInOptimizedCode, 0, 1)
diff --git a/deps/v8/src/tracing/trace-event.h b/deps/v8/src/tracing/trace-event.h
index 2b3bf9bf92cca8..246ddd3aba3bd7 100644
--- a/deps/v8/src/tracing/trace-event.h
+++ b/deps/v8/src/tracing/trace-event.h
@@ -478,7 +478,7 @@ static V8_INLINE uint64_t AddTraceEvent(char phase,
                                         uint64_t id, uint64_t bind_id,
                                         unsigned int flags) {
   return TRACE_EVENT_API_ADD_TRACE_EVENT(phase, category_group_enabled, name,
-                                         scope, id, bind_id, kZeroNumArgs, NULL,
+                                         id, bind_id, kZeroNumArgs, NULL,
                                          NULL, NULL, flags);
 }
 
@@ -492,7 +492,7 @@ static V8_INLINE uint64_t AddTraceEvent(
   uint64_t arg_values[1];
   SetTraceValue(arg1_val, &arg_types[0], &arg_values[0]);
   return TRACE_EVENT_API_ADD_TRACE_EVENT(
-      phase, category_group_enabled, name, scope, id, bind_id, num_args,
+      phase, category_group_enabled, name, id, bind_id, num_args,
       &arg1_name, arg_types, arg_values, flags);
 }
 
@@ -509,7 +509,7 @@ static V8_INLINE uint64_t AddTraceEvent(
   SetTraceValue(arg1_val, &arg_types[0], &arg_values[0]);
   SetTraceValue(arg2_val, &arg_types[1], &arg_values[1]);
   return TRACE_EVENT_API_ADD_TRACE_EVENT(
-      phase, category_group_enabled, name, scope, id, bind_id, num_args,
+      phase, category_group_enabled, name, id, bind_id, num_args,
       arg_names, arg_types, arg_values, flags);
 }
 
diff --git a/deps/v8/test/cctest/heap/test-incremental-marking.cc b/deps/v8/test/cctest/heap/test-incremental-marking.cc
index 74cbf2cb34ed56..765ae53afbf260 100644
--- a/deps/v8/test/cctest/heap/test-incremental-marking.cc
+++ b/deps/v8/test/cctest/heap/test-incremental-marking.cc
@@ -86,7 +86,7 @@ class MockPlatform : public v8::Platform {
   }
 
   uint64_t AddTraceEvent(char phase, const uint8_t* categoryEnabledFlag,
-                         const char* name, const char* scope, uint64_t id,
+                         const char* name, uint64_t id,
                          uint64_t bind_id, int numArgs, const char** argNames,
                          const uint8_t* argTypes, const uint64_t* argValues,
                          unsigned int flags) override {
diff --git a/deps/v8/test/cctest/test-trace-event.cc b/deps/v8/test/cctest/test-trace-event.cc
index 190cb4078296a3..4678147931d3d0 100644
--- a/deps/v8/test/cctest/test-trace-event.cc
+++ b/deps/v8/test/cctest/test-trace-event.cc
@@ -72,7 +72,7 @@ class MockTracingPlatform : public v8::Platform {
   void PerformDelayedTask() {}
 
   uint64_t AddTraceEvent(char phase, const uint8_t* category_enabled_flag,
-                         const char* name, const char* scope, uint64_t id,
+                         const char* name, uint64_t id,
                          uint64_t bind_id, int num_args, const char** arg_names,
                          const uint8_t* arg_types, const uint64_t* arg_values,
                          unsigned int flags) override {
diff --git a/deps/v8/test/mjsunit/es6/debug-promises/events.js b/deps/v8/test/mjsunit/es6/debug-promises/events.js
new file mode 100644
index 00000000000000..3fcb22ff274098
--- /dev/null
+++ b/deps/v8/test/mjsunit/es6/debug-promises/events.js
@@ -0,0 +1,122 @@
+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --allow-natives-syntax --expose-debug-as debug
+
+Debug = debug.Debug;
+
+var eventsExpected = 16;
+var exception = null;
+var result = [];
+
+function updatePromise(promise, parentPromise, status, value) {
+  var i;
+  for (i = 0; i < result.length; ++i) {
+    if (result[i].promise === promise) {
+      result[i].parentPromise = parentPromise || result[i].parentPromise;
+      result[i].status = status || result[i].status;
+      result[i].value = value || result[i].value;
+      break;
+    }
+  }
+  assertTrue(i < result.length);
+}
+
+function listener(event, exec_state, event_data, data) {
+  if (event != Debug.DebugEvent.PromiseEvent) return;
+  try {
+    eventsExpected--;
+    assertTrue(event_data.promise().isPromise());
+    if (event_data.status() === 0) {
+      // New promise.
+      assertEquals("pending", event_data.promise().status());
+      result.push({ promise: event_data.promise().value(), status: 0 });
+      assertTrue(exec_state.frame(0).sourceLineText().indexOf("// event") > 0);
+    } else if (event_data.status() !== undefined) {
+      // Resolve/reject promise.
+      updatePromise(event_data.promise().value(),
+                    undefined,
+                    event_data.status(),
+                    event_data.value().value());
+    } else {
+      // Chain promises.
+      assertTrue(event_data.parentPromise().isPromise());
+      updatePromise(event_data.promise().value(),
+                    event_data.parentPromise().value());
+      assertTrue(exec_state.frame(0).sourceLineText().indexOf("// event") > 0);
+    }
+  } catch (e) {
+    print(e + e.stack)
+    exception = e;
+  }
+}
+
+Debug.setListener(listener);
+
+function resolver(resolve, reject) { resolve(); }
+
+var p1 = new Promise(resolver);  // event
+var p2 = p1.then().then();  // event
+var p3 = new Promise(function(resolve, reject) {  // event
+  reject("rejected");
+});
+var p4 = p3.then();  // event
+var p5 = p1.then();  // event
+
+function assertAsync(b, s) {
+  if (b) {
+    print(s, "succeeded");
+  } else {
+    %AbortJS(s + " FAILED!");
+  }
+}
+
+function testDone(iteration) {
+  function checkResult() {
+    if (eventsExpected === 0) {
+      assertAsync(result.length === 6, "result.length");
+
+      assertAsync(result[0].promise === p1, "result[0].promise");
+      assertAsync(result[0].parentPromise === undefined,
+                  "result[0].parentPromise");
+      assertAsync(result[0].status === 1, "result[0].status");
+      assertAsync(result[0].value === undefined, "result[0].value");
+
+      assertAsync(result[1].parentPromise === p1,
+                  "result[1].parentPromise");
+      assertAsync(result[1].status === 1, "result[1].status");
+
+      assertAsync(result[2].promise === p2, "result[2].promise");
+
+      assertAsync(result[3].promise === p3, "result[3].promise");
+      assertAsync(result[3].parentPromise === undefined,
+                  "result[3].parentPromise");
+      assertAsync(result[3].status === -1, "result[3].status");
+      assertAsync(result[3].value === "rejected", "result[3].value");
+
+      assertAsync(result[4].promise === p4, "result[4].promise");
+      assertAsync(result[4].parentPromise === p3,
+                  "result[4].parentPromise");
+      assertAsync(result[4].status === -1, "result[4].status");
+      assertAsync(result[4].value === "rejected", "result[4].value");
+
+      assertAsync(result[5].promise === p5, "result[5].promise");
+      assertAsync(result[5].parentPromise === p1,
+                  "result[5].parentPromise");
+      assertAsync(result[5].status === 1, "result[5].status");
+
+      assertAsync(exception === null, "exception === null");
+      Debug.setListener(null);
+    } else if (iteration > 10) {
+      %AbortJS("Not all events were received!");
+    } else {
+      testDone(iteration + 1);
+    }
+  }
+
+  var iteration = iteration || 0;
+  %EnqueueMicrotask(checkResult);
+}
+
+testDone();
diff --git a/deps/v8/test/mjsunit/es6/debug-promises/resolve-after-aborted-try-finally.js b/deps/v8/test/mjsunit/es6/debug-promises/resolve-after-aborted-try-finally.js
new file mode 100644
index 00000000000000..918ae2a2e8769d
--- /dev/null
+++ b/deps/v8/test/mjsunit/es6/debug-promises/resolve-after-aborted-try-finally.js
@@ -0,0 +1,32 @@
+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --expose-debug-as debug --allow-natives-syntax
+
+// Test debug events when we listen to all exceptions and
+// there is a catch handler for the exception thrown in a Promise.
+// We expect a normal Exception debug event to be triggered.
+
+Debug = debug.Debug;
+
+var events = [];
+
+function listener(event, exec_state, event_data, data) {
+  if (event == Debug.DebugEvent.PromiseEvent) events.push(event_data.status());
+}
+
+Debug.setListener(listener);
+
+var p = new Promise(function(resolve, reject) {
+  do {
+    try {
+      throw new Error("reject");
+    } finally {
+      break;  // No rethrow.
+    }
+  } while (false);
+  resolve();
+});
+
+assertEquals([0 /* create */, 1 /* resolve */], events);
diff --git a/deps/v8/test/mjsunit/es6/debug-promises/resolve-after-try-catch.js b/deps/v8/test/mjsunit/es6/debug-promises/resolve-after-try-catch.js
new file mode 100644
index 00000000000000..298201f103e8cf
--- /dev/null
+++ b/deps/v8/test/mjsunit/es6/debug-promises/resolve-after-try-catch.js
@@ -0,0 +1,29 @@
+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --expose-debug-as debug --allow-natives-syntax
+
+// Test debug events when we listen to all exceptions and
+// there is a catch handler for the exception thrown in a Promise.
+// We expect a normal Exception debug event to be triggered.
+
+Debug = debug.Debug;
+
+var events = [];
+
+function listener(event, exec_state, event_data, data) {
+  if (event == Debug.DebugEvent.PromiseEvent) events.push(event_data.status());
+}
+
+Debug.setListener(listener);
+
+var p = new Promise(function (resolve, reject) {
+  try {
+    throw new Error("reject");
+  } catch (e) {
+  }
+  resolve();
+});
+
+assertEquals([0 /* create */, 1 /* resolve */], events);
diff --git a/deps/v8/test/mjsunit/es6/debug-promises/rethrow-in-try-finally.js b/deps/v8/test/mjsunit/es6/debug-promises/rethrow-in-try-finally.js
new file mode 100644
index 00000000000000..b1e2ff98e1a0b5
--- /dev/null
+++ b/deps/v8/test/mjsunit/es6/debug-promises/rethrow-in-try-finally.js
@@ -0,0 +1,30 @@
+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --expose-debug-as debug --allow-natives-syntax
+
+// Test debug events when we listen to all exceptions and
+// there is a catch handler for the exception thrown in a Promise.
+// We expect a normal Exception debug event to be triggered.
+
+Debug = debug.Debug;
+
+var events = [];
+
+function listener(event, exec_state, event_data, data) {
+  if (event == Debug.DebugEvent.PromiseEvent) events.push(event_data.status());
+}
+
+Debug.setListener(listener);
+
+var p = new Promise(function(resolve, reject) {
+  try {
+    throw new Error("reject");
+  } finally {
+    // Implicit rethrow.
+  }
+  resolve();
+});
+
+assertEquals([0 /* create */, -1 /* rethrown */], events);