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

ui/events/gesture_detection/gesture_provider.cc

 // 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.
 
 #include "ui/events/gesture_detection/gesture_provider.h"
 
 #include <cmath>
 
 #include "base/auto_reset.h"
 #include "base/debug/trace_event.h"
@@ skipping 625 matching lines @@
 }
 
 void GestureProvider::ResetGestureDetectors() {
   if (!current_down_event_)
     return;
   scoped_ptr<MotionEvent> cancel_event = current_down_event_->Cancel();
   gesture_listener_->OnTouchEvent(*cancel_event, false);
   scale_gesture_listener_->OnTouchEvent(*cancel_event);
 }
 
-void GestureProvider::CancelActiveTouchSequence() {
+bool GestureProvider::CancelActiveTouchSequence() {
   if (!current_down_event_)
-    return;
+    return false;
   OnTouchEvent(*current_down_event_->Cancel());
-  current_down_event_.reset();
+  return true;
 }
 
 void GestureProvider::SetMultiTouchSupportEnabled(bool enabled) {
   scale_gesture_listener_->set_ignore_detector_events(!enabled);
 }
 
 void GestureProvider::SetDoubleTapSupportForPlatformEnabled(bool enabled) {
   gesture_listener_->SetDoubleTapSupportForPlatformEnabled(enabled);
 }
 
@@ skipping 144 matching lines @@
 void GestureProvider::EndTouchScrollIfNecessary(base::TimeTicks time,
                                                 bool send_scroll_end_event) {
   if (!touch_scroll_in_progress_)
     return;
   touch_scroll_in_progress_ = false;
   if (send_scroll_end_event)
     Send(CreateGesture(GESTURE_SCROLL_END, time, 0, 0));
 }
 
 }  //  namespace ui