GitLab

If no gesture handler has been established prior to RootView
receiving a ui::ET_GESTURE_END event, do not perform any
targeting based on the event's location (and therefore do not
dispatch this event to any view); GESTURE_END should only
ever be targeted and dispatched to the gesture handler set
by a previous gesture.

BUG=409918
TEST=ViewTargeterTest.ViewTargeterForGestureEvents,
     WidgetTest.GestureBeginAndEndEvents,
     WidgetTest.DisabledGestureEventTarget

Review URL: https://codereview.chromium.org/533793002

Cr-Commit-Position: refs/heads/master@{#292983}