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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}