Disable overscroll navigation when emulating touch.

content/browser/web_contents/web_contents_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_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 488 matching lines @@
       bool* is_keyboard_shortcut) OVERRIDE;
   virtual void HandleKeyboardEvent(
       const NativeWebKeyboardEvent& event) OVERRIDE;
   virtual bool HandleWheelEvent(
       const blink::WebMouseWheelEvent& event) OVERRIDE;
   virtual bool PreHandleGestureEvent(
       const blink::WebGestureEvent& event) OVERRIDE;
   virtual bool HandleGestureEvent(
       const blink::WebGestureEvent& event) OVERRIDE;
   virtual void DidSendScreenRects(RenderWidgetHostImpl* rwh) OVERRIDE;
+  virtual void OnTouchEmulationEnabled(bool enabled) OVERRIDE;
 #if defined(OS_WIN)
   virtual gfx::NativeViewAccessible GetParentNativeViewAccessible() OVERRIDE;
 #endif
 
   // RenderFrameHostManager::Delegate ------------------------------------------
 
   virtual bool CreateRenderViewForRenderManager(
       RenderViewHost* render_view_host,
       int opener_route_id,
       int proxy_routing_id,
@@ skipping 596 matching lines @@
   int fullscreen_widget_routing_id_;
 
   // Maps the ids of pending image downloads to their callbacks
   typedef std::map<int, ImageDownloadCallback> ImageDownloadMap;
   ImageDownloadMap image_download_map_;
 
   // Whether this WebContents is responsible for displaying a subframe in a
   // different process from its parent page.
   bool is_subframe_;
 
+  // Whether touch emulation is enabled in RenderWidgetHost.
+  bool touch_emulation_enabled_;
+
   // Whether the last JavaScript dialog shown was suppressed. Used for testing.
   bool last_dialog_suppressed_;
 
   scoped_ptr<GeolocationDispatcherHost> geolocation_dispatcher_host_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_