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Speculative fix to single process mash content_browsertests
start-up hang by allowing nested task while waiting for display.

Bug: 892173
Change-Id: Ia146293d8f2553cd8233feae80786e56402c7c55
Reviewed-on: https://chromium-review.googlesource.com/c/1262925Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597150}