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Currently VR pauses/unpuases VSync during certain transitions. These
calls work when the Browser's AndroidWindow is the VSync provider, but
not when using a remote GPU proc VSync provider. Forward these signals
to the GPU process.

TBR=yfriedman for really uninteresting test-code update.

Bug: 871774
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: Ic47cb14fdf702e294db90b5ad69b8cdfb5c67403
Reviewed-on: https://chromium-review.googlesource.com/1175198Reviewed-by: Eric Karl <ericrk@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Commit-Queue: Eric Karl <ericrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583505}