Don't send touch move to renderer while scrolling

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 326 matching lines @@
   }
 
   bool input_method_active() const {
     return input_method_active_;
   }
 
   bool ShouldForwardTouchEvent() const;
 
   bool has_touch_handler() const { return has_touch_handler_; }
 
+  bool is_scroll_update_in_progress() const {
+    return scroll_update_in_progress_;
+  }
+
   // Notification that the user has made some kind of input that could
   // perform an action. See OnUserGesture for more details.
   void StartUserGesture();
 
   // Set the RenderView background.
   void SetBackground(const SkBitmap& background);
 
   // Notifies the renderer that the next key event is bound to one or more
   // pre-defined edit commands
   void SetEditCommandsForNextKeyEvent(
@@ skipping 549 matching lines @@
   // switching back to the original tab, because the content may already be
   // changed.
   bool suppress_next_char_events_;
 
   // The last scroll offset of the render widget.
   gfx::Vector2d last_scroll_offset_;
 
   bool pending_mouse_lock_request_;
   bool allow_privileged_mouse_lock_;
 
+  bool scroll_update_in_progress_;
+
   // 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_;
 
   base::WeakPtrFactory<RenderWidgetHostImpl> weak_factory_;
 
   SmoothScrollGestureController smooth_scroll_gesture_controller_;
   scoped_ptr<TouchEventQueue> touch_event_queue_;
   scoped_ptr<GestureEventFilter> gesture_event_filter_;
   scoped_ptr<OverscrollController> overscroll_controller_;
 
 #if defined(OS_WIN)
   std::list<HWND> dummy_windows_for_activation_;
 #endif
 
   // List of callbacks for pending snapshot requests to the renderer.
   std::queue<base::Callback<void(bool, const SkBitmap&)> > pending_snapshots_;
 
   int64 last_input_number_;
 
   BrowserRenderingStats rendering_stats_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_