Reland: Add Scoped Context Info (Isolate) to V8 Traces

src/libplatform/default-platform.cc

 // Copyright 2013 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.
 
 #include "src/libplatform/default-platform.h"
 
 #include <algorithm>
 #include <queue>
 
 #include "src/base/logging.h"
@@ skipping 154 matching lines @@
 
 
 double DefaultPlatform::MonotonicallyIncreasingTime() {
   return base::TimeTicks::HighResolutionNow().ToInternalValue() /
          static_cast<double>(base::Time::kMicrosecondsPerSecond);
 }
 
 
 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,
+    const char** arg_names, const uint8_t* arg_types,
+    const uint64_t* arg_values, unsigned int flags) {
+  return 0;
+}
+
+
+// TODO(fmeawad): Remove once all embedders implement the scope version.
+uint64_t DefaultPlatform::AddTraceEvent(
+    char phase, const uint8_t* category_enabled_flag, 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) {
   return 0;
 }
 
 
 void DefaultPlatform::UpdateTraceEventDuration(
     const uint8_t* category_enabled_flag, const char* name, uint64_t handle) {}
 
 
 const uint8_t* DefaultPlatform::GetCategoryGroupEnabled(const char* name) {
   static uint8_t no = 0;
   return &no;
 }
 
 
 const char* DefaultPlatform::GetCategoryGroupName(
     const uint8_t* category_enabled_flag) {
   static const char dummy[] = "dummy";
   return dummy;
 }
 
+
 size_t DefaultPlatform::NumberOfAvailableBackgroundThreads() {
   return static_cast<size_t>(thread_pool_size_);
 }
 
 }  // namespace platform
 }  // namespace v8