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ThreadTicks::Now() is not available on some platforms and thus we can't
measure GpuBlockedTime there. This CL skips measuring/reporting if not
available to prevent DCHECK's and invalid data.

Bug: 1021494
Change-Id: I8c7d7f8cdae478b0b5012a5267aa909d62da6408
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1899587Reviewed-by: Jonathan Backer <backer@chromium.org>
Commit-Queue: Jonathan Backer <backer@chromium.org>
Commit-Queue: Vasiliy Telezhnikov <vasilyt@chromium.org>
Auto-Submit: Vasiliy Telezhnikov <vasilyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712579}