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Flag an error if not in whitelist. Skip over rejected commands.

I used a fake (InProcCommandBuffer) instead of a mock
because it was too difficult to inject (e.g. if you use a fake
GrContext, you have to use fake GrBackendTexture, etc).

Bug: 836928
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: I7e3a996fb17491b755f0423d205b385c437f7509
Reviewed-on: https://chromium-review.googlesource.com/1057891
Commit-Queue: Jonathan Backer <backer@chromium.org>
Reviewed-by: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558423}