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Currently, the wrong context is being used inside the
SharedImageRepresentations when using multiple contexts
across multiple threads.

This CL will route the correct context to each
SharedImageRepresentation.

Bug: 938594
Change-Id: I5c0e7583258f3e1c7256d39223b4c9b4b738b8ee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1542785
Commit-Queue: Chris Blume <cblume@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Eric Karl <ericrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#646621}