[Android] Thoroughly reset gesture detection upon page navigation

ui/events/gesture_detection/filtered_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_FILTERED_GESTURE_PROVIDER_H_
 #define UI_EVENTS_GESTURE_DETECTION_FILTERED_GESTURE_PROVIDER_H_
 
 #include "base/basictypes.h"
 #include "ui/events/gesture_detection/gesture_event_data_packet.h"
 #include "ui/events/gesture_detection/gesture_provider.h"
@@ skipping 15 matching lines @@
   // Returns true if |event| was both valid and successfully handled by the
   // gesture provider.  Otherwise, returns false, in which case the caller
   // should drop |event|, not forwarding it to the renderer.
   bool OnTouchEvent(const MotionEvent& event);
 
   // To be called upon ack of an event that was forwarded after a successful
   // call to |OnTouchEvent()|.
   void OnTouchEventAck(bool event_consumed);
 
   // Methods delegated to |gesture_provider_|.
+  void ResetDetection();
   void SetMultiTouchZoomSupportEnabled(bool enabled);
   void SetDoubleTapSupportForPlatformEnabled(bool enabled);
   void SetDoubleTapSupportForPageEnabled(bool enabled);
   const ui::MotionEvent* GetCurrentDownEvent() const;
 
  private:
   // GestureProviderClient implementation.
   void OnGestureEvent(const ui::GestureEventData& event) override;
 
   // TouchDispositionGestureFilterClient implementation.
   void ForwardGestureEvent(const ui::GestureEventData& event) override;
 
   GestureProviderClient* const client_;
 
   ui::GestureProvider gesture_provider_;
   ui::TouchDispositionGestureFilter gesture_filter_;
 
   bool handling_event_;
   ui::GestureEventDataPacket pending_gesture_packet_;
 
   DISALLOW_COPY_AND_ASSIGN(FilteredGestureProvider);
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_GESTURE_DETECTION_FILTERED_GESTURE_PROVIDER_H_