This is a almost entirely a copy of the necessary parts of the
Raster command decoder.
Implements one dummy command (called Dummy) which will be replaced
by real commands.
Bug: 868192
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: Iccc1274fb251896b404573de4738b5b37b16b316
Reviewed-on: https://chromium-review.googlesource.com/1147251
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585762}
ccab4bc383