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In DoEndRasterCHROMIUM skia flushes the GL work for the complete tile
in its GrOpList in prepareForExternalIO which can be a slow operation.
Make sure the watchdog thread is notified to avoid spurious hangs.

R=piman@chromium.org

Bug: 934483
Change-Id: Ifb35ceb70da93796b59da5b9bff78636cd4cea0d
Reviewed-on: https://chromium-review.googlesource.com/c/1482032
Commit-Queue: Khushal <khushalsagar@chromium.org>
Auto-Submit: Khushal <khushalsagar@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634483}