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On Chrome OS, we're seeing a relatively rare crash on submitting an
SkiaOutputDeviceBufferQueue::Submit [1]. The stack trace from the
crashes is pretty inconclusive (no real line number). After looking
at the code, I suspect it's because ScopedSkiaWriteAccess is null,
but I'd like to upgrade the DCHECK to a CHECK here to confirm.

[1] https://bugs.chromium.org/p/chromium/issues/detail?id=1156158

Bug: 1156158
Change-Id: Ibacc53efed6a2fe899afb408692e87314ef98d0b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2643485Reviewed-by: Peng Huang <penghuang@chromium.org>
Commit-Queue: Brian Ho <hob@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845866}