[Android] Always insert a TouchCancel if window or tab focus is lost

content/browser/renderer_host/input/content_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 CONTENT_BROWSER_RENDERER_HOST_INPUT_CONTENT_GESTURE_PROVIDER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_CONTENT_GESTURE_PROVIDER_H_
 
 #include "base/basictypes.h"
 #include "content/port/common/input_event_ack_state.h"
 #include "ui/events/gesture_detection/gesture_event_data_packet.h"
@@ skipping 30 matching lines @@
   // To be called upon ack of an event that was forwarded after a successful
   // call to |OnTouchEvent()|.
   void OnTouchEventAck(InputEventAckState ack_state);
 
   // Methods delegated to |gesture_provider_|.
   void ResetGestureDetectors();
   void CancelActiveTouchSequence();
   void SetMultiTouchSupportEnabled(bool enabled);
   void SetDoubleTapSupportForPlatformEnabled(bool enabled);
   void SetDoubleTapSupportForPageEnabled(bool enabled);
+  const ui::MotionEvent* GetCurrentDownEvent() const;
 
  private:
   // ui::GestureProviderClient
   virtual void OnGestureEvent(const ui::GestureEventData& event) OVERRIDE;
 
   // TouchDispositionGestureFilterClient
   virtual void ForwardGestureEvent(const ui::GestureEventData& event) OVERRIDE;
 
   ContentGestureProviderClient* const client_;
   float touch_to_gesture_scale_;
 
   ui::GestureProvider gesture_provider_;
   ui::TouchDispositionGestureFilter gesture_filter_;
 
   bool handling_event_;
   ui::GestureEventDataPacket pending_gesture_packet_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentGestureProvider);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_CONTENT_GESTURE_PROVIDER_H_