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In the renderer we'd like to prioritize loading and compositing tasks
until first contentful paint.  That makes the already flaky
NestedPopupMenuTest worse.  With the new policy we sometimes get a
different pop up rect size (80x53 instead of 110x110). This seems
to be because there isn't always a layout before the mouse clicks
are sent.  Adding a call to WaitForHitTestData fixes this.


Bug: 971191
Change-Id: I70e89c74ee79cb36854e63e5f2e2c5b7e5fdff58
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1823865
Auto-Submit: Alex Clarke <alexclarke@chromium.org>
Commit-Queue: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701112}