Also time other API functions calling into javascript.

src/log.h

 // Copyright 2012 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 58 matching lines @@
 // --prof
 // Collect statistical profiling information (ticks), default is off.  The
 // tick profiler requires code events, so --prof implies --log-code.
 
 // Forward declarations.
 class LogMessageBuilder;
 class Profiler;
 class Semaphore;
 class SlidingStateWindow;
 class Ticker;
+class Isolate;
 
 #undef LOG
 #define LOG(isolate, Call)                          \
   do {                                              \
     v8::internal::Logger* logger =                  \
         (isolate)->logger();                        \
     if (logger->is_logging())                       \
       logger->Call;                                 \
   } while (false)
 
@@ skipping 182 matching lines @@
   void SharedLibraryEvent(const char* library_path,
                           uintptr_t start,
                           uintptr_t end);
   void SharedLibraryEvent(const wchar_t* library_path,
                           uintptr_t start,
                           uintptr_t end);
   void TimerEvent(const char* name, int64_t start, int64_t end);
 
   class TimerEventScope {
    public:
-    TimerEventScope(Logger* logger, const char* name)
-        : logger_(logger), name_(name), start_(0) {
+    TimerEventScope(Isolate* isolate, const char* name)
+        : isolate_(isolate), name_(name), start_(0) {
       if (FLAG_log_timer_events) start_ = OS::Ticks();
     }
 
     ~TimerEventScope() {
-      if (FLAG_log_timer_events) {
-        logger_->TimerEvent(name_, start_, OS::Ticks());
-      }
+      if (FLAG_log_timer_events) LogTimerEvent();
     }
 
+    void LogTimerEvent();
+
     static const char* v8_recompile_synchronous;
     static const char* v8_recompile_parallel;
     static const char* v8_compile_full_code;
     static const char* v8_execute;
 
    private:
-    Logger* logger_;
+    Isolate* isolate_;
     const char* name_;
     int64_t start_;
   };
 
   // ==== Events logged by --log-regexp ====
   // Regexp compilation and execution events.
 
   void RegExpCompileEvent(Handle<JSRegExp> regexp, bool in_cache);
 
   // Log an event reported from generated code
@@ skipping 208 matching lines @@
 // Class that extracts stack trace, used for profiling.
 class StackTracer : public AllStatic {
  public:
   static void Trace(Isolate* isolate, TickSample* sample);
 };
 
 } }  // namespace v8::internal
 
 
 #endif  // V8_LOG_H_