histogram synchronizer code between renderer and browser for UMA and about_histogram

chrome/renderer/render_thread.cc

Index: chrome/renderer/render_thread.cc
===================================================================
--- chrome/renderer/render_thread.cc	(revision 15278)
+++ chrome/renderer/render_thread.cc	(working copy)
@@ -95,8 +95,8 @@
   return dns_master_->Resolve(name, length);
 }
 
-void RenderThread::SendHistograms() {
-  return histogram_snapshots_->SendHistograms();
+void RenderThread::SendHistograms(int sequence_number) {
+  return histogram_snapshots_->SendHistograms(sequence_number);
 }
 
 static WebAppCacheContext* CreateAppCacheContextForRenderer() {
@@ -185,7 +185,7 @@
     IPC_MESSAGE_HANDLER(ViewMsg_New, OnCreateNewView)
     IPC_MESSAGE_HANDLER(ViewMsg_SetCacheCapacities, OnSetCacheCapacities)
     IPC_MESSAGE_HANDLER(ViewMsg_GetRendererHistograms,
-                          OnGetRendererHistograms)
+                        OnGetRendererHistograms)
     IPC_MESSAGE_HANDLER(ViewMsg_GetCacheResourceStats,
                         OnGetCacheResourceStats)
     IPC_MESSAGE_HANDLER(ViewMsg_UserScripts_NewScripts,
@@ -247,8 +247,8 @@
   Send(new ViewHostMsg_ResourceTypeStats(stats));
 }
 
-void RenderThread::OnGetRendererHistograms() {
-  SendHistograms();
+void RenderThread::OnGetRendererHistograms(int sequence_number) {
+  SendHistograms(sequence_number);
 }
 
 void RenderThread::InformHostOfCacheStats() {