Expose whether a frame is focused to the browser process

content/browser/renderer_host/render_widget_host_impl.h

 // Copyright (c) 2012 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_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 
 #include <deque>
 #include <list>
 #include <map>
@@ skipping 115 matching lines @@
 
   void set_hung_renderer_delay_ms(const base::TimeDelta& timeout) {
     hung_renderer_delay_ms_ = timeout.InMilliseconds();
   }
 
   // RenderWidgetHost implementation.
   void UpdateTextDirection(blink::WebTextDirection direction) override;
   void NotifyTextDirection() override;
   void Focus() override;
   void Blur() override;
+  bool IsFocused() const override;
   void SetActive(bool active) override;
   void CopyFromBackingStore(const gfx::Rect& src_rect,
                             const gfx::Size& accelerated_dst_size,
                             ReadbackRequestCallback& callback,
                             const SkColorType color_type) override;
   bool CanCopyFromBackingStore() override;
 #if defined(OS_ANDROID)
   virtual void LockBackingStore() override;
   virtual void UnlockBackingStore() override;
 #endif
@@ skipping 675 matching lines @@
   std::list<HWND> dummy_windows_for_activation_;
 #endif
 
   RenderWidgetHostLatencyTracker latency_tracker_;
 
   int next_browser_snapshot_id_;
   typedef std::map<int,
       base::Callback<void(const unsigned char*, size_t)> > PendingSnapshotMap;
   PendingSnapshotMap pending_browser_snapshots_;
 
+  bool is_focused_;
+
   base::WeakPtrFactory<RenderWidgetHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_