Support tracking focused element for OOPIFs.

content/browser/frame_host/render_frame_host_delegate.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_DELEGATE_H_
 #define CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_DELEGATE_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 18 matching lines @@
 
 namespace IPC {
 class Message;
 }
 
 namespace device {
 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;
 struct AXLocationChangeNotificationDetails;
 struct ContextMenuParams;
 struct FileChooserParams;
 
 // An interface implemented by an object interested in knowing about the state
 // of the RenderFrameHost.
 class CONTENT_EXPORT RenderFrameHostDelegate {
@@ skipping 151 matching lines @@
 
   // Set the |node| frame as focused in the current FrameTree as well as
   // possibly changing focus in distinct but related inner/outer WebContents.
   virtual void SetFocusedFrame(FrameTreeNode* node, SiteInstance* source) {}
 
   // Creates a WebUI object for a frame navigating to |url|. If no WebUI
   // applies, returns null.
   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() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_DELEGATE_H_