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The popErrorScope() was changed to reject with an OperationError if the
GPUDevice is lost[1]. So, this patch matches up with the spec. Also,
although the spec doesn't mention it yet, we should make it throw an
OperationError for all cases where the device is lost.

[1] https://github.com/gpuweb/gpuweb/pull/433

Bug: 852089
Change-Id: I3a80b5e741e1ea831fd92aa2eb3dcdafd6bc740e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1898891Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712587}