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This reverts commit d15ba9ba.

Reason for revert: This doesn't seem to solve the deadline reporting bug. This was a speculative fix that didn't fix the issue.

Original change's description:
> Surface synchronization: Don't report blocked duration of throttled children
> 
> A child can be "throttled" for an arbitrary length of time if it is never
> embedded. This skews blocked duration metrics. Simply don't report those
> metrics if a surface is blocked on a parent.
> 
> Bug: 890767
> Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
> Change-Id: I3c8a8494a5b1e5a973b2e5c2b61cffe5c2b76f6f
> Reviewed-on: https://chromium-review.googlesource.com/c/1274591
> Commit-Queue: Fady Samuel <fsamuel@chromium.org>
> Reviewed-by: Saman Sami <samans@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#598886}

TBR=fsamuel@chromium.org,samans@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 890767
Change-Id: I3b1188d49a1301681391d526abaa25dcabf69f79
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Reviewed-on: https://chromium-review.googlesource.com/c/1281083Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Commit-Queue: Fady Samuel <fsamuel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599716}