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In some cases, ScopedReadLockSkImage is not able to read back the
texture, because it does not know the hardware supports texture
rectangles. In that case, fall back to using CopyTextureCHROMIUM
to copy the mask texture into an SkImage.

Bug: 984766
Change-Id: I0a348a98767405f61810b03217ef96bb2b5bba2c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1730291Reviewed-by: Eric Karl <ericrk@chromium.org>
Commit-Queue: Mason Freed <masonfreed@chromium.org>
Auto-Submit: Mason Freed <masonfreed@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683771}