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This CL copies https://skia-review.googlesource.com/c/skia/+/312056 and
uses coherent memory on mobile GPUs, which demonstrated a significant
CPU saving on Android.

Change-Id: I3ca13695a168e7b998b9ebffddab06d21f10983b
Bug: 1167904
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2636380Reviewed-by: Vasiliy Telezhnikov <vasilyt@chromium.org>
Commit-Queue: Jonathan Backer <backer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844619}