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The SkiaRenderer cannot handle SW compositing, chrome will crash if
the SkiaRenderer is created with a SW output surface. This CL fixes
the crash.

Bug: None
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: I8e60c6e07a2f39cfda58af3a1ae7f190d3ed88f6
Reviewed-on: https://chromium-review.googlesource.com/1101159
Commit-Queue: Peng Huang <penghuang@chromium.org>
Reviewed-by: weiliangc <weiliangc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567426}