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

ui/events/gesture_detection/gesture_provider.cc

Index: ui/events/gesture_detection/gesture_provider.cc
diff --git a/ui/events/gesture_detection/gesture_provider.cc b/ui/events/gesture_detection/gesture_provider.cc
index 5120d00b6c20dd216930b582930727eea5d253aa..9a31872bcea61e36252b0c4d2f152dd288ef0cae 100644
--- a/ui/events/gesture_detection/gesture_provider.cc
+++ b/ui/events/gesture_detection/gesture_provider.cc
@@ -643,11 +643,11 @@ void GestureProvider::ResetGestureDetectors() {
   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) {