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This CL adds a ScheduleImageDecode() method to RasterInterface that
locks a transfer cache entry and sends an image decode request. This is
done so that it's convenient for the GpuImageDecodeCache to eventually
request image decodes.

Note that a new interface was introduced:
ImageDecodeAcceleratorInterface. This is necessary to allow
RasterImplementation to use ImageDecodeAcceleratorProxy without breaking
dependencies.

Bug: 868400
Change-Id: Ib24ffa9f5855cc843e1bf83ef4cd2ebb039c04d8
Reviewed-on: https://chromium-review.googlesource.com/c/1313671Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: Andres Calderon Jaramillo <andrescj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611304}