Histograms - Support histograms for Plugins, GPU

content/common/child_thread.h

Index: content/common/child_thread.h
===================================================================
--- content/common/child_thread.h	(revision 140625)
+++ content/common/child_thread.h	(working copy)
@@ -14,6 +14,7 @@
 #include "content/common/message_router.h"
 #include "webkit/glue/resource_loader_bridge.h"
 
+class ChildHistogramMessageFilter;
 class FileSystemDispatcher;
 class MessageLoop;
 class QuotaDispatcher;
@@ -79,6 +80,10 @@
   // lifetime is less than the main thread.
   IPC::SyncMessageFilter* sync_message_filter();
 
+  ChildHistogramMessageFilter* child_histogram_message_filter() const {
+    return histogram_message_filter_;
+  }
+
   MessageLoop* message_loop();
 
   // Returns the one child thread.
@@ -144,6 +149,8 @@
 
   scoped_ptr<QuotaDispatcher> quota_dispatcher_;
 
+  ChildHistogramMessageFilter* histogram_message_filter_;
+
   DISALLOW_COPY_AND_ASSIGN(ChildThread);
 };