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VideoResourceUpdater currently uses LayerTreeFrameSink as the interface
through which to notify the display compositor about shared bitmaps.
This doesn't work UseSurfaceLayerForVideo where there is no
LayerTreeFrameSink.

Pull the two required functions out of LayerTreeFrameSink and into
SharedBitmapReporter. LayerTreeFrameSink has SharedBitmapReporter as a
subclass and doesn't implement the functions so nothing changes with
regards to it. VideoResourceUpdater now takes a SharedBitmapReporter
instead of a LayerTreeFrameSink.

An implementation of SharedBitmapReporter that calls into
mojom::CompositorFrameSinkPtr can be added trivially to support
UseSurfaceLayerInVideo after this patch.

Bug: 807840
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I9a5a07140f8aa1614d1b647f3af1dd5d7aab2cd2
Reviewed-on: https://chromium-review.googlesource.com/1053054
Commit-Queue: kylechar <kylechar@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558011}