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This also introduces the first use of HangWatchScopeDisabled to ignore
cases where tasks are not processed because an nested loop is processing
only native events.

Bug: 1034046
Change-Id: I5f425226d20d3c0f75038f0ea234ae7308bcbc9a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2340076Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Commit-Queue: François Doray <fdoray@chromium.org>
Auto-Submit: Oliver Li <olivierli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798769}