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To support OOPR, we need switch from SkCanvas to PaintCanvas which is for
OOPR.

Bug: 895568
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I94b5430c7ee8ed2f5140d352214ec43f2ff0f8ad
Reviewed-on: https://chromium-review.googlesource.com/c/1286950
Commit-Queue: Peng Huang <penghuang@chromium.org>
Reviewed-by: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609033}