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Some tab-dragging test cases never finishes on SingleProcessMash,
and it turns out that WindowEventDispatcher thinks some
TOUCH_RELEASED events can be invalid; it won't generate any
gestures and does not do anything. In that case, OnEvent()
won't be called and any other methods are not called, therefore
InjectedEventHandler couldn't notify it's done.

This CL adds a new method to WindowEventDispatcherObserver to
catch such cases and allow handling it's done.

BUG=890071
TEST=see the filter update

Change-Id: I6dcda9af52e5cbd4013b8d228bda2e9b1f14bdd6
Reviewed-on: https://chromium-review.googlesource.com/c/1316767
Commit-Queue: Jun Mukai <mukai@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605531}