Add support for allowing an embedder to get the V8 profile timer event logs.

src/log.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1107 matching lines @@
 
 
 void Logger::LeaveExternal(Isolate* isolate) {
   LOG(isolate, TimerEvent(END, TimerEventScope::v8_external));
   ASSERT(isolate->current_vm_state() == EXTERNAL);
   isolate->set_current_vm_state(JS);
 }
 
 
 void Logger::TimerEventScope::LogTimerEvent(StartEnd se) {
-  LOG(isolate_, TimerEvent(se, name_));
+  if (FLAG_log_internal_timer_events)

[Yang, 2014/03/05 08:18:31]

We always use brackets if an if-clause contains a linebreak. Either use brackets
or don't linebreak please.

[fmeawad, 2014/03/06 00:24:46]

Fixed in Patch 5, removed in Patch 6.

+    LOG(isolate_, TimerEvent(se, name_));
+  if (se == START) {
+    LOG_EVENT_BEGIN(isolate_, name_);
+  } else {
+    LOG_EVENT_END(isolate_, name_);
+  }
 }
 
 
 const char* Logger::TimerEventScope::v8_recompile_synchronous =
     "V8.RecompileSynchronous";
 const char* Logger::TimerEventScope::v8_recompile_concurrent =
     "V8.RecompileConcurrent";
 const char* Logger::TimerEventScope::v8_compile_full_code =
     "V8.CompileFullCode";
 const char* Logger::TimerEventScope::v8_execute = "V8.Execute";
@@ skipping 1014 matching lines @@
   if (jit_logger_) {
     removeCodeEventListener(jit_logger_);
     delete jit_logger_;
     jit_logger_ = NULL;
   }
 
   return log_->Close();
 }
 
 } }  // namespace v8::internal