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The scheduler expects balanced callbacks of DidHandleInputEventOnMainThread()
and DidHandleInputEventOnCompositorThread(EVENT_FORWARDED_TO_MAIN_THREAD).
If the expectation is broken, the wrongly-maintained UserModel would produce
an endless loop of UpdatePolicy(), which consumes device power.

Also makes corresponding changes to unit test.

Bug: 837105
Change-Id: Ib5193041728a97f055df757a33680e788dd4c876
Reviewed-on: https://chromium-review.googlesource.com/1032468Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556077}