Add support for latency measurement to Telemetry smoothness benchmarks.

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index 19a035d4e2e7f14196da9a5bdb54dd713c178e16..18b77eb1cb8e5d0162e81f43d273e282f621d306 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -345,6 +345,8 @@ bool RenderWidget::OnMessageReceived(const IPC::Message& message) {
     IPC_MESSAGE_HANDLER(ViewMsg_ShowImeIfNeeded, OnShowImeIfNeeded)
 #endif
     IPC_MESSAGE_HANDLER(ViewMsg_Snapshot, OnSnapshot)
+    IPC_MESSAGE_HANDLER(ViewMsg_SetBrowserRenderingStats,
+                        OnSetBrowserRenderingStats)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -2324,6 +2326,15 @@ RenderWidgetCompositor* RenderWidget::compositor() const {
   return compositor_.get();
 }
 
+void RenderWidget::OnSetBrowserRenderingStats(
+    const BrowserRenderingStats& stats) {
+  browser_rendering_stats_ = stats;
+}
+
+void RenderWidget::GetBrowserRenderingStats(BrowserRenderingStats* stats) {
+  *stats = browser_rendering_stats_;
+}
+
 void RenderWidget::BeginSmoothScroll(
     bool down,
     const SmoothScrollCompletionCallback& callback,