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

include/v8-platform.h

 // 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.
 
 #ifndef V8_V8_PLATFORM_H_
 #define V8_V8_PLATFORM_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 134 matching lines @@
   /**
    * Adds a trace event to the platform tracing system. This function call is
    * usually the result of a TRACE_* macro from trace_event_common.h when
    * tracing and the category of the particular trace are enabled. It is not
    * advisable to call this function on its own; it is really only meant to be
    * used by the trace macros. The returned handle can be used by
    * UpdateTraceEventDuration to update the duration of COMPLETE events.
    */
   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) {
+    return AddTraceEvent(phase, category_enabled_flag, name, id, bind_id,
+                         num_args, arg_names, arg_types, arg_values, flags);
+  }
+
+  /**
+   * This method will soon be depreacted in favor of the version with the 'const
+   * char* scope' parameter. If you do not already override this method, please
+   * implement the other version instead.
+   */
+  // TODO(fmeawad): Remove once all embedders implement the scope version.
+  virtual uint64_t AddTraceEvent(
+      char phase, const uint8_t* category_enabled_flag, 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,
       unsigned int flags) {
     return 0;
   }
 
   /**
    * Sets the duration field of a COMPLETE trace event. It must be called with
    * the handle returned from AddTraceEvent().
    **/
   virtual void UpdateTraceEventDuration(const uint8_t* category_enabled_flag,
                                         const char* name, uint64_t handle) {}
 };
 
 }  // namespace v8
 
 #endif  // V8_V8_PLATFORM_H_