Clear pending events upon main frame navigation

ui/events/gesture_detection/gesture_provider.h

 // Copyright 2014 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 UI_EVENTS_GESTURE_DETECTION_GESTURE_PROVIDER_H_
 #define UI_EVENTS_GESTURE_DETECTION_GESTURE_PROVIDER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/events/gesture_detection/gesture_detection_export.h"
@@ skipping 46 matching lines @@
     float max_gesture_bounds_length;
   };
 
   GestureProvider(const Config& config, GestureProviderClient* client);
   ~GestureProvider();
 
   // Handle the incoming MotionEvent, returning false if the event could not
   // be handled.
   bool OnTouchEvent(const MotionEvent& event);
 
+  // Cancel any current gesture detection, also preventing any pending
+  // timeout-based events.
+  void ResetDetection();
+
   // Update whether multi-touch pinch zoom is supported by the platform.
   void SetMultiTouchZoomSupportEnabled(bool enabled);
 
   // Update whether double-tap gestures are supported by the platform.
   void SetDoubleTapSupportForPlatformEnabled(bool enabled);
 
   // Update whether double-tap gesture detection should be suppressed, e.g.,
   // if the page scale is fixed or the page has a mobile viewport. This disables
   // the tap delay, allowing rapid and responsive single-tap gestures.
   void SetDoubleTapSupportForPageEnabled(bool enabled);
@@ skipping 31 matching lines @@
   // Whether double-tap gesture detection is currently supported.
   bool double_tap_support_for_page_;
   bool double_tap_support_for_platform_;
 
   const bool gesture_begin_end_types_enabled_;
 };
 
 }  //  namespace ui
 
 #endif  // UI_EVENTS_GESTURE_DETECTION_GESTURE_PROVIDER_H_