Support tracking focused element for OOPIFs.

content/browser/frame_host/render_frame_host_delegate.h

Index: content/browser/frame_host/render_frame_host_delegate.h
diff --git a/content/browser/frame_host/render_frame_host_delegate.h b/content/browser/frame_host/render_frame_host_delegate.h
index 6f3497ca3439fc0dba77c337296323adaf3a2629..20a5565593102094ea433a247e3f93dbda5654d5 100644
--- a/content/browser/frame_host/render_frame_host_delegate.h
+++ b/content/browser/frame_host/render_frame_host_delegate.h
@@ -36,11 +36,16 @@ class GeolocationServiceContext;
 class WakeLockServiceContext;
 }
 
+namespace gfx {
+class Rect;
+}
+
 namespace content {
 class FrameTreeNode;
 class InterstitialPage;
 class PageState;
 class RenderFrameHost;
+class RenderFrameHostImpl;
 class ScreenOrientationProvider;
 class WebContents;
 struct AXEventNotificationDetails;
@@ -212,6 +217,13 @@ class CONTENT_EXPORT RenderFrameHostDelegate {
   virtual std::unique_ptr<WebUIImpl> CreateWebUIForRenderFrameHost(
       const GURL& url);
 
+  // Called by |frame| to notify that it has received an update on focused
+  // element. |bounds_in_frame_widget| is the rectangle containing the element

[ncarter (slow), 2016/12/16 19:17:20]

|bounds_in_frame_widget| or |bounds_in_root_view|?

[EhsanK, 2016/12/20 16:39:10]

Sorry. |boudns_in_root_view|. Thanks! Done.

+  // focused and is with respect to frame's RenderWidgetHost's coordinate space.
+  virtual void OnFocusedElementChangedInFrame(
+      RenderFrameHostImpl* frame,
+      const gfx::Rect& bounds_in_root_view) {}
+
  protected:
   virtual ~RenderFrameHostDelegate() {}
 };