Implement tracing interface for v8

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 <stdint.h>
+
 namespace v8 {
 
 class Isolate;
 
 /**
  * A Task represents a unit of work.
  */
 class Task {
  public:
   virtual ~Task() {}
@@ skipping 82 matching lines @@
   }
 
   /**
    * Monotonically increasing time in seconds from an arbitrary fixed point in
    * the past. This function is expected to return at least
    * millisecond-precision values. For this reason,
    * it is recommended that the fixed point be no further in the past than
    * the epoch.
    **/
   virtual double MonotonicallyIncreasingTime() = 0;
+
+  virtual const uint8_t* GetCategoryGroupEnabled(const char* name) = 0;
+  virtual const char* GetCategoryGroupName(
+      const uint8_t* categoryEnabledFlag) = 0;
+
+  virtual uint64_t AddTraceEvent(char phase, const uint8_t* categoryEnabledFlag,
+                                 const char* name, uint64_t id,
+                                 uint64_t context_id, uint64_t bind_id,
+                                 int32_t numArgs, const char** argNames,
+                                 const uint8_t* argTypes,
+                                 const uint64_t* argValues,
+                                 unsigned int flags) = 0;
+
+  virtual void UpdateTraceEventDuration(const uint8_t* categoryEnabledFlag,
+                                        const char* name, uint64_t handle) = 0;

[noordhuis, 2015/10/07 18:31:54]

These really need elucidating comments, either inline or as links to online or
in-repo documentation.

Style issue: I think V8 prefers snake_case over camelCase, i.e.,
category_enabled_flag instead of categoryEnabledFlag.

[fmeawad, 2015/11/19 02:00:46]

Done

 };
 
 }  // namespace v8
 
 #endif  // V8_V8_PLATFORM_H_