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This CL adds a bool to track whether the user is interacting via touch
or mouse. When the user is interacting via touch, we ignore certain
pointer events that were causing many issues on Android (or any touch-
enabled device).

In particular, this fixes an issue where users were unable to use the
overlay play button in certain cases. The underlying chain of events
that caused the button to not receive a tap was:

1) While controls are shown, user taps on overlay play button to pause
2) MediaControlsImpl sees a pointerout event from the user's tap, and
   stops the hide timer
3) OnTimeUpdate fired, seeing a stopped timer and hiding the controls
4) MediaControlsImpl sees a gesturetap from the user's tap, and decides
   to show the controls
5) The controls reappear, but the user's tap has already been handled
   and the overlay play button sees nothing

Bug: 822763
Change-Id: Ia085c7f1cd082c0f44b60f22333146cd6de5f841
Reviewed-on: https://chromium-review.googlesource.com/982900Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547695}