Record Chrome trace events in tcmalloc heap profiles

content/child/child_thread.h

 // 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.
 
 #ifndef CONTENT_CHILD_CHILD_THREAD_H_
 #define CONTENT_CHILD_CHILD_THREAD_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/shared_memory.h"
 #include "base/tracked_objects.h"
 #include "content/common/content_export.h"
 #include "content/common/message_router.h"
 #include "ipc/ipc_message.h"  // For IPC_MESSAGE_LOG_ENABLED.
 #include "webkit/glue/resource_loader_bridge.h"
 
 namespace base {
 class MessageLoop;
-}
+
+namespace debug {
+class TraceMemoryController;
+}  // namespace debug
+}  // namespace base
 
 namespace IPC {
 class SyncChannel;
 class SyncMessageFilter;
-}
+}  // namespace IPC
 
 namespace WebKit {
 class WebFrame;
-}
+}  // namespace WebKit
 
 namespace content {
 class ChildHistogramMessageFilter;
 class ChildResourceMessageFilter;
 class FileSystemDispatcher;
 class QuotaDispatcher;
 class ResourceDispatcher;
 class SocketStreamDispatcher;
 class ThreadSafeSender;
 
@@ skipping 139 matching lines @@
   scoped_ptr<FileSystemDispatcher> file_system_dispatcher_;
 
   scoped_ptr<QuotaDispatcher> quota_dispatcher_;
 
   scoped_refptr<ChildHistogramMessageFilter> histogram_message_filter_;
 
   scoped_refptr<ChildResourceMessageFilter> resource_message_filter_;
 
   base::WeakPtrFactory<ChildThread> channel_connected_factory_;
 
+  // Observes the trace event system. When tracing is enabled, optionally
+  // starts profiling the tcmalloc heap.
+  scoped_ptr<base::debug::TraceMemoryController> trace_memory_controller_;
+
   DISALLOW_COPY_AND_ASSIGN(ChildThread);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_CHILD_THREAD_H_