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This scope object can be used to disable hang watching when it is known
an operation can run in unbounded time. HangWatchScope is renamed to
HangWatchScopeEnabled as part of this change also for symmetry.

This is done through the introduction of a new persistent flag
kHasActiveHangWatchScopeDisabled that can ensure that new
HangWatchScopeEnabled instances do not count towards hang watching.

Bug: 1034046
Change-Id: I9d8d8b2812a31fe29ba7980d64567798ada3b432
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2288195Reviewed-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@{#796459}