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We would like to verify Skia DDL correctness for rastering work. So a
new flag --enable-oop-rasterization-ddl is added. With this flag, the
raster decoder will record raster work into a DDL first, and then play it
back into a SkSurface. Right now, recording and playing back are on the
GPU main thread. In future, the recording could be moved to raster worker
threads.

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: Iba462c6a2376b9ab6fc663c97b913e568a5a8bce
Reviewed-on: https://chromium-review.googlesource.com/1169150Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Peng Huang <penghuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#588880}