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The GPU process is now armed to detect hangs during shutdown. This also fixes
a problem that ReportProgress() is called without Arm() first and a DCHECK is
triggered due to the wrong Arm/InProgress/Disarm order. Calling Arm() when the
GPU starts to shut down fix this order issue.

Bug:949839, 674475

Change-Id: I5f8ec78787945a09ad6cf519506175386e24a646
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1775214
Commit-Queue: Maggie Chen <magchen@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#691945}