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Browser UI thread can be blocked on viz compositor or viz main. RunTaskAfterWindowReady blocks viz main on DRM thread when it is posted by PostSyncTask. These tasks need browser to call CreateWindow through mojo pipe to continue.
Deadlocks are caused by this. RunTaskAfterWindowReady needs to be relaxed to lower crash rates.

Bug: 1050676
Change-Id: Ie205300fa68300f129c1bb1e7d746c6399a65013
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2135128
Commit-Queue: Kramer Ge <fangzhoug@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756756}