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When starting a new vsync/frame, the previous frame should explicitly be
marked as 'did not produce frame'. This assertion is failing on webview.
So introduce a speculative fix for the crash to unblock the release,
while we investigate the underlying issue.

BUG=1144353

Change-Id: I436cc0a0115287967f9007a91e40ec41b3b69f84
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2626770Reviewed-by: Behdad Bakhshinategh <behdadb@chromium.org>
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843017}