Initialize StatisticsRecorder in Child Process to hold

content/common/child_process.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_COMMON_CHILD_PROCESS_H_
 #define CONTENT_COMMON_CHILD_PROCESS_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/threading/thread.h"
 #include "base/synchronization/waitable_event.h"
 #include "content/common/content_export.h"
 
+namespace base {
+class StatisticsRecorder;
+}
+
 class ChildThread;
 
 // Base class for child processes of the browser process (i.e. renderer and
 // plugin host). This is a singleton object for each child process.
 class CONTENT_EXPORT ChildProcess {
  public:
   // Child processes should have an object that derives from this class.
   // Normally you would immediately call set_main_thread after construction.
   ChildProcess();
   virtual ~ChildProcess();
@@ skipping 39 matching lines @@
   base::WaitableEvent shutdown_event_;
 
   // The thread that handles IO events.
   base::Thread io_thread_;
 
   // NOTE: make sure that main_thread_ is listed after shutdown_event_, since
   // it depends on it (indirectly through IPC::SyncChannel).  Same for
   // io_thread_.
   scoped_ptr<ChildThread> main_thread_;
 
+  // |statistics_recorder_| holds all histograms in the child process.
+  scoped_ptr<base::StatisticsRecorder> statistics_recorder_;
+
   // The singleton instance for this process.
   static ChildProcess* child_process_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildProcess);
 };
 
 #endif  // CONTENT_COMMON_CHILD_PROCESS_H_