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This will facilitate integration with the ANGLE-controlled program
cache that we will use with the passthrough command buffer.

Refactoring change only.

BUG=738513
R=piman@chromium.org

Change-Id: I10f0ccd05680496885467fd22ce9d1e1a486741f
Reviewed-on: https://chromium-review.googlesource.com/563610
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486028}