Also time external callbacks from generated code.

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 709 matching lines @@
   if (old_tag != EXTERNAL && new_tag == EXTERNAL) {
     enter_external_ = OS::Ticks();
   }
   if (old_tag == EXTERNAL && new_tag != EXTERNAL && enter_external_ != 0) {
     TimerEvent("V8.External", enter_external_, OS::Ticks());
     enter_external_ = 0;
   }
 }
 
 
+void Logger::EnterExternal() {
+  LOGGER->enter_external_ = OS::Ticks();
+}
+
+
+void Logger::LeaveExternal() {
+  if (enter_external_ == 0) return;
+  Logger* logger = LOGGER;
+  logger->TimerEvent("V8.External", enter_external_, OS::Ticks());
+  logger->enter_external_ = 0;
+}
+
+
 int64_t Logger::enter_external_ = 0;
 
 
 void Logger::TimerEventScope::LogTimerEvent() {
   LOG(isolate_, TimerEvent(name_, start_, OS::Ticks()));
 }
 
 
 const char* Logger::TimerEventScope::v8_recompile_synchronous =
     "V8.RecompileSynchronous";
@@ skipping 1178 matching lines @@
 void SamplerRegistry::RemoveActiveSampler(Sampler* sampler) {
   ASSERT(sampler->IsActive());
   ScopedLock lock(active_samplers_mutex);
   ASSERT(active_samplers_ != NULL);
   bool removed = active_samplers_->RemoveElement(sampler);
   ASSERT(removed);
   USE(removed);
 }
 
 } }  // namespace v8::internal