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)
@@ -20,6 +20,10 @@
 class ResourceDispatcher;
 class SocketStreamDispatcher;
 
+namespace content {
+class ChildHistogramMessageFilter;
+}
+
 namespace IPC {
 class SyncChannel;
 class SyncMessageFilter;
@@ -79,6 +83,10 @@
   // lifetime is less than the main thread.
   IPC::SyncMessageFilter* sync_message_filter();
 
+  content::ChildHistogramMessageFilter* child_histogram_message_filter() const {
+    return histogram_message_filter_.get();
+  }
+
   MessageLoop* message_loop();
 
   // Returns the one child thread.
@@ -144,6 +152,8 @@
 
   scoped_ptr<QuotaDispatcher> quota_dispatcher_;
 
+  scoped_refptr<content::ChildHistogramMessageFilter> histogram_message_filter_;
+
   DISALLOW_COPY_AND_ASSIGN(ChildThread);
 };