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With skia running in the GPU process for OOP raster, it needs to be
able to make discardable memory allocations. Set up a connection to
the discardable memory service from the GPU process.

R=piman@chromium.org

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I5cbd5677c5c6bffd3f7492862b1825d186b19a9d
Reviewed-on: https://chromium-review.googlesource.com/923208
Commit-Queue: Khushal <khushalsagar@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: David Reveman <reveman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539029}