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If in software rendering mode, a copy request
of the layer is not in the root or first render pass,
there will be double locking resource crash.
Now we first release old lock and then try to
obtain lock again.

R=danakj@chromium.org

TEST=SoftwareRendererTest.DoubleLockTextureCrash

Review URL: https://codereview.chromium.org/899183003

Cr-Commit-Position: refs/heads/master@{#315155}