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Some examples and tests create InProcessCommandBuffer without
GpuChannelManagerDelegate. Some of them would crash trying to report new
GpuBlockedTimeBetweenSwaps metric because of it. This CL fixes crash.

Fixed: 1022412
Change-Id: I61a0a8a663d91bcf608ec2992d01b9d0752de8c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1903841Reviewed-by: Jonathan Backer <backer@chromium.org>
Commit-Queue: Vasiliy Telezhnikov <vasilyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713512}