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We currently rely both on the timing history and whether the main thread
responded within the frame deadline to decide whether to prioritize impl
side invalidations. The latter had a bug where we incorrectly assumed the
main thread is missing deadlines when impl thread is high latency/swap
throttled. Update the logic to account for the second case.

R=sunnyps@chromium.org
Bug:1086790

Change-Id: I0b163e99c2a2081518ba89b0743c9de9836ba8b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2217062
Commit-Queue: Khushal <khushalsagar@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Auto-Submit: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#775824}