Record Chrome trace events in tcmalloc heap profiles

base/debug/trace_event_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/debug/trace_event_impl.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/debug/leak_annotations.h"
@@ skipping 1033 matching lines @@
 
 void TraceLog::RemoveEnabledStateObserver(EnabledStateObserver* listener) {
   std::vector<EnabledStateObserver*>::iterator it =
       std::find(enabled_state_observer_list_.begin(),
                 enabled_state_observer_list_.end(),
                 listener);
   if (it != enabled_state_observer_list_.end())
     enabled_state_observer_list_.erase(it);
 }
 
+bool TraceLog::HasEnabledStateObserver(EnabledStateObserver* listener) const {
+  std::vector<EnabledStateObserver*>::const_iterator it =
+      std::find(enabled_state_observer_list_.begin(),
+                enabled_state_observer_list_.end(),
+                listener);
+  return it != enabled_state_observer_list_.end();
+}
+
 float TraceLog::GetBufferPercentFull() const {
   return (float)((double)logged_events_->Size()/(double)kTraceEventBufferSize);
 }
 
 void TraceLog::SetNotificationCallback(
     const TraceLog::NotificationCallback& cb) {
   AutoLock lock(lock_);
   notification_callback_ = cb;
 }
 
 TraceBuffer* TraceLog::GetTraceBuffer() {
   if (trace_options_ & RECORD_CONTINUOUSLY)
     return new TraceBufferRingBuffer();
   else if (trace_options_ & ECHO_TO_VLOG)
     return new TraceBufferDiscardsEvents();
   return new TraceBufferVector();
 }
 
 void TraceLog::SetEventCallback(EventCallback cb) {
   AutoLock lock(lock_);
   event_callback_ = cb;
 };
 
 void TraceLog::Flush(const TraceLog::OutputCallback& cb) {
+  // Ignore memory allocations from here down.
+  INTERNAL_TRACE_MEMORY(TRACE_DISABLED_BY_DEFAULT("memory"),
+                        TRACE_MEMORY_IGNORE);
   scoped_ptr<TraceBuffer> previous_logged_events;
   {
     AutoLock lock(lock_);
     previous_logged_events.swap(logged_events_);
     logged_events_.reset(GetTraceBuffer());
   }  // release lock
 
   while (previous_logged_events->HasMoreEvents()) {
     scoped_refptr<RefCountedString> json_events_str_ptr =
         new RefCountedString();
@@ skipping 548 matching lines @@
         0,                       // num_args
         NULL,                    // arg_names
         NULL,                    // arg_types
         NULL,                    // arg_values
         NULL,                    // convertable values
         TRACE_EVENT_FLAG_NONE);  // flags
   }
 }
 
 }  // namespace trace_event_internal