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... to prevent deadlocking against stream consumer that may be blocked
because of virtual time.

Change-Id: Ic823f056677d707291c2cfd60bc8f8677d10c070
Reviewed-on: https://chromium-review.googlesource.com/c/1359414Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613375}