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This sends the safe areas from Android to Blink using the
DisplayCutoutClient Mojo interface.

This CL also includes instrumentation tests for end to end
testing of Display Cutout on Android.

BUG=847652

Change-Id: Ide2bed7878a22d649914fde66083c28374f4d768
Reviewed-on: https://chromium-review.googlesource.com/1097802
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570293}