Modified RenderFrameObserver API

content/public/renderer/render_frame_observer.h

Index: content/public/renderer/render_frame_observer.h
diff --git a/content/public/renderer/render_frame_observer.h b/content/public/renderer/render_frame_observer.h
index 1e3c6717945067d9aacb6ba5b855d97782e443e9..7b4eeb795b5d20bf8316a7262b8434f64766ad45 100644
--- a/content/public/renderer/render_frame_observer.h
+++ b/content/public/renderer/render_frame_observer.h
@@ -99,6 +99,9 @@ class CONTENT_EXPORT RenderFrameObserver : public IPC::Listener,
   // Called when a compositor frame has committed.
   virtual void DidCommitCompositorFrame() {}
 
+  // Notifications when |PerformanceTiming| data becomes available
+  virtual void DidChangePerformanceTiming() {}
+
   // Called when the focused node has changed to |node|.
   virtual void FocusedNodeChanged(const blink::WebNode& node) {}