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This CL plumbs the has_transparent_background bit through RenderFrameMetadata
on android when surface synchronization is enabled. This enables the correct
background color to be displayed when surface sync is on on android.

Bug: 672962
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Id8ca61371cbe04a7ea58fbbf255bf80f6208e2b8
Reviewed-on: https://chromium-review.googlesource.com/1100065
Commit-Queue: Fady Samuel <fsamuel@chromium.org>
Reviewed-by: Saman Sami <samans@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567080}