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Introduces the mojo IDL and implementation "glue" to be able to create
overlays to be rendered on top of each video frame captured by a
FrameSinkVideoCapturer. This allows for use cases like mouse cursor
rendering and debug status displays. Also, the new overlay APIs have
been added to ClientFrameSinkVideoCapturer (a client-side wrapper that
handles the auto-reconnecting-to-VIZ after a VIZ process crash).

Bug: 810133
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: I963b6a1d736e1510618a723694f3b22ac0bf1589
Reviewed-on: https://chromium-review.googlesource.com/1150929
Commit-Queue: Yuri Wiitala <miu@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Reviewed-by: Saman Sami <samans@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Reviewed-by: Xiangjun Zhang <xjz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579654}