base

Make TvInputService skip to dispatch media keys to an overlay view

If media keys are dispatched to an overlay view, it is always consumed
because of fallback logic. Therefore, TvInputService skips to dispatch
media keys to an overlay view in order to return the keys back to
an application.

Bug: 18195249
Change-Id: I1cb4c9de5a73bd741ab64b1b85e9c986a1a92a90