Add initialization for has_external_callback field.

src/cpu-profiler-inl.h

 // Copyright 2010 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 52 matching lines @@
 
 
 TickSampleEventRecord* TickSampleEventRecord::init(void* value) {
   TickSampleEventRecord* result =
       reinterpret_cast<TickSampleEventRecord*>(value);
   result->filler = 1;
   ASSERT(result->filler != SamplingCircularQueue::kClear);
   // Init the required fields only.
   result->sample.pc = NULL;
   result->sample.frames_count = 0;
+  result->sample.has_external_callback = false;
   return result;
 }
 
 
 TickSample* ProfilerEventsProcessor::TickSampleEvent() {
   generator_->Tick();
   TickSampleEventRecord* evt =
       TickSampleEventRecord::init(ticks_buffer_.Enqueue());
   evt->order = enqueue_order_;  // No increment!
   return &evt->sample;
 }
 
 
 bool ProfilerEventsProcessor::FilterOutCodeCreateEvent(
     Logger::LogEventsAndTags tag) {
   return FLAG_prof_browser_mode
       && (tag != Logger::CALLBACK_TAG
           && tag != Logger::FUNCTION_TAG
           && tag != Logger::LAZY_COMPILE_TAG
           && tag != Logger::REG_EXP_TAG
           && tag != Logger::SCRIPT_TAG);
 }
 
 } }  // namespace v8::internal
 
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 #endif  // V8_CPU_PROFILER_INL_H_