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This test is flaky on the bots when run as part of the suite. Although
unable to reproduce locally, the calls to ExecuteJavaScript were failing
which points to a general test problem.

Without being attached to a windowed view, WKWebView can internally
suspend processes. Add the |web_view| to a windowed container to try to
prevent flake.

Additionally, extend the timeout for JavaScript execution because the
old timeout was too short for JavaScript execution to always complete.

Bug: 1013206
Change-Id: I1bd685563bc0e522647ab0402e64428fa746e430
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1856659Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Auto-Submit: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706639}