Support InputRouter recycling

content/browser/renderer_host/render_widget_host_impl.h

Index: content/browser/renderer_host/render_widget_host_impl.h
diff --git a/content/browser/renderer_host/render_widget_host_impl.h b/content/browser/renderer_host/render_widget_host_impl.h
index f0da2fb3f7b20248934a64b1f872672bb7f3a92e..4b1abe7fd9b2157fcaf1ba12184b9c1e6e31d4fa 100644
--- a/content/browser/renderer_host/render_widget_host_impl.h
+++ b/content/browser/renderer_host/render_widget_host_impl.h
@@ -362,8 +362,6 @@ class CONTENT_EXPORT RenderWidgetHostImpl
   // Event queries delegated to the |input_router_|.
   bool ShouldForwardTouchEvent() const;
 
-  bool has_touch_handler() const { return has_touch_handler_; }
-
   // Notification that the user has made some kind of input that could
   // perform an action. See OnUserGesture for more details.
   void StartUserGesture();
@@ -433,11 +431,11 @@ class CONTENT_EXPORT RenderWidgetHostImpl
   // suppress_next_char_events_.
   void SuppressNextCharEvents();
 
-  // Called by RenderWidgetHostView in response to OnSetNeedsFlushInput.
+  // Called by the view in response to flush requests.
   void FlushInput();
 
-  // InputRouterClient
-  virtual void SetNeedsFlush() override;
+  // Request a flush from the view.
+  void SetNeedsFlush();
 
   // Indicates whether the renderer drives the RenderWidgetHosts's size or the
   // other way around.
@@ -648,7 +646,6 @@ class CONTENT_EXPORT RenderWidgetHostImpl
       const ui::LatencyInfo& latency_info) override;
   virtual void IncrementInFlightEventCount() override;
   virtual void DecrementInFlightEventCount() override;
-  virtual void OnHasTouchEventHandlers(bool has_handlers) override;
   virtual void DidFlush() override;
   virtual void DidOverscroll(const DidOverscrollParams& params) override;
 
@@ -819,11 +816,6 @@ class CONTENT_EXPORT RenderWidgetHostImpl
   bool pending_mouse_lock_request_;
   bool allow_privileged_mouse_lock_;
 
-  // Keeps track of whether the webpage has any touch event handler. If it does,
-  // then touch events are sent to the renderer. Otherwise, the touch events are
-  // not sent to the renderer.
-  bool has_touch_handler_;
-
   scoped_ptr<SyntheticGestureController> synthetic_gesture_controller_;
 
   scoped_ptr<TouchEmulator> touch_emulator_;