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 1032 matching lines @@
     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.
+  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 457 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