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Layout test initialization is non-deterministic. WidgetInputHandler::OnFocus()
races against the contents of the layout test, which may also attempt to
set/unset focus -- the ordering between the two is non-deterministic. This CL
adds a FlushForTesting() message to WidgetInputHandler to make the ordering
explicit.

Bug: 889036, 889952
Change-Id: I26adca82915e75a9941c93b60a555f0c16084014
Reviewed-on: https://chromium-review.googlesource.com/c/1255782Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596321}