partial PageClickTracker migration to RenderFrameObserver

content/public/renderer/render_frame.h

Index: content/public/renderer/render_frame.h
diff --git a/content/public/renderer/render_frame.h b/content/public/renderer/render_frame.h
index a5add52ab9a7e8dd6d3aee458037695c3dffe59c..6b32dd5b8608d7390bade0b3ae9da6b5511f91bc 100644
--- a/content/public/renderer/render_frame.h
+++ b/content/public/renderer/render_frame.h
@@ -16,6 +16,7 @@
 class GURL;
 
 namespace blink {
+class WebElement;
 class WebFrame;
 class WebLocalFrame;
 class WebNode;
@@ -62,6 +63,10 @@ class CONTENT_EXPORT RenderFrame : public IPC::Listener,
   // Returns the associated WebFrame.
   virtual blink::WebLocalFrame* GetWebFrame() = 0;
 
+  // Gets the focused element. If no such element exists then
+  // the element will be Null.
+  virtual blink::WebElement GetFocusedElement() const = 0;
+
    // Gets WebKit related preferences associated with this frame.
   virtual WebPreferences& GetWebkitPreferences() = 0;