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Also makes some preparations for doing the same for VP9.

Bug: 647725, 847573
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: Id263a35b9f53be062ebae54d05c603a3efb270e8
Reviewed-on: https://chromium-review.googlesource.com/1153840
Commit-Queue: Fredrik Hubinette <hubbe@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586324}