Add RenderFrameObserver::FocusedNodeChanged

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 b806b0f19ba92e7f064a21a8cc9f8f4398a48237..f2c429b5d971eeaf324d4717af698647ffc3909d 100644
--- a/content/public/renderer/render_frame_observer.h
+++ b/content/public/renderer/render_frame_observer.h
@@ -16,6 +16,7 @@
 namespace blink {
 class WebFormElement;
 class WebFrame;
+class WebNode;
 struct WebURLError;
 }
 
@@ -85,6 +86,9 @@ class CONTENT_EXPORT RenderFrameObserver : public IPC::Listener,
   // Called when a compositor frame has committed.
   virtual void DidCommitCompositorFrame() {}
 
+  // Called when the focused node has changed to |node|.
+  virtual void FocusedNodeChanged(const blink::WebNode& node) {}
+
   // IPC::Listener implementation.
   bool OnMessageReceived(const IPC::Message& message) override;