Expose whether a frame is focused to the browser process

content/browser/frame_host/render_frame_host_impl.h

Index: content/browser/frame_host/render_frame_host_impl.h
diff --git a/content/browser/frame_host/render_frame_host_impl.h b/content/browser/frame_host/render_frame_host_impl.h
index e9649758eed0a210b94fe3583e3a8e901f5476be..c9193a3080131997b6b1f299a898d078efba9ae2 100644
--- a/content/browser/frame_host/render_frame_host_impl.h
+++ b/content/browser/frame_host/render_frame_host_impl.h
@@ -134,9 +134,9 @@ class CONTENT_EXPORT RenderFrameHostImpl
   void ExecuteJavaScript(const base::string16& javascript,
                          const JavaScriptResultCallback& callback) override;
   void ExecuteJavaScriptForTests(const base::string16& javascript) override;
+  void ActivateFindInPageResultForAccessibility(int request_id) override;
   RenderViewHost* GetRenderViewHost() override;
   ServiceRegistry* GetServiceRegistry() override;
-  void ActivateFindInPageResultForAccessibility(int request_id) override;
 
   // IPC::Sender
   bool Send(IPC::Message* msg) override;
@@ -405,6 +405,11 @@ class CONTENT_EXPORT RenderFrameHostImpl
   // this instance and its associated render frame.
   void InvalidateMojoConnection();
 
+  // Returns whether the frame is focused. A frame is considered focused when it
+  // is the parent chain of the focused frame within the frame tree. In
+  // addition, its associated RenderWidgetHostView has to be focused.
+  bool IsFocused();
+
  protected:
   friend class RenderFrameHostFactory;