Implement tracing interface for v8

include/v8-platform.h

Index: include/v8-platform.h
diff --git a/include/v8-platform.h b/include/v8-platform.h
index c6cba0f982929aa8795e214c89f9fc1adc4ffb11..374fd9da26393e6ed0240b458c411a775407ac82 100644
--- a/include/v8-platform.h
+++ b/include/v8-platform.h
@@ -5,6 +5,8 @@
 #ifndef V8_V8_PLATFORM_H_
 #define V8_V8_PLATFORM_H_
 
+#include <stdint.h>
+
 namespace v8 {
 
 class Isolate;
@@ -107,6 +109,21 @@ class Platform {
    * 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