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This is the first step necessary prior to introduce a LinearGradientQuadRenderer.

Bug: 843239
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;master.tryserver.chromium.linux:linux_vr
Change-Id: I1be5e6265b99a153c3b7dba6e385f965952bac15
Reviewed-on: https://chromium-review.googlesource.com/1060120
Commit-Queue: Aldo Culquicondor <acondor@chromium.org>
Reviewed-by: Christopher Grant <cjgrant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559135}