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Failure is expected when the GL context is lost and so we should not
assert as Skia's default handler does.

Bug: 999327
Bug: 1000384
Change-Id: Iab2bd55a674e5143ec006959889a462511cdeabf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1783297Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
Cr-Commit-Position: refs/heads/master@{#692844}