Adding UMA for sync IPCs

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index 15e3246cb598ca5a4b34f5448e8798b165e97110..7d713fea16de4db779f623d31a789bce35591e59 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -902,6 +902,8 @@ bool RenderProcessHostImpl::OnMessageReceived(const IPC::Message& msg) {
                           SuddenTerminationChanged)
       IPC_MESSAGE_HANDLER(ViewHostMsg_UserMetricsRecordAction,
                           OnUserMetricsRecordAction)
+      IPC_MESSAGE_HANDLER(ViewHostMsg_SyncIPCElapsedTime,
+                          OnSyncIPCElapsedTime)
       IPC_MESSAGE_HANDLER(ViewHostMsg_SavedPageAsMHTML, OnSavedPageAsMHTML)
       // Adding single handlers for your service here is fine, but once your
       // service needs more than one handler, please extract them into a new
@@ -1366,6 +1368,10 @@ void RenderProcessHostImpl::OnUserMetricsRecordAction(
   content::RecordComputedAction(action);
 }
 
+void RenderProcessHostImpl::OnSyncIPCElapsedTime(const base::TimeDelta& delta) {
+  HISTOGRAM_TIMES("RendererSyncIPC.ElapsedTime", delta);
+}
+
 void RenderProcessHostImpl::OnSavedPageAsMHTML(int job_id, int64 data_size) {
   MHTMLGenerationManager::GetInstance()->MHTMLGenerated(job_id, data_size);
 }