Initialize StatisticsRecorder in Child Process to hold

content/common/child_process.h

Index: content/common/child_process.h
===================================================================
--- content/common/child_process.h	(revision 147145)
+++ content/common/child_process.h	(working copy)
@@ -11,6 +11,10 @@
 #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
@@ -70,6 +74,9 @@
   // 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_;