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Also adds unit tests to cover HighBD support on various platforms.

Bug: 1128445
Change-Id: I9951a49f0fca311f48ff55c1618f3d18343dfca8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2427556
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: James Zern <jzern@google.com>
Cr-Commit-Position: refs/heads/master@{#810904}