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BrowserCommandController interactive test ensures the recent changes of browser
shortcuts in fullscreen won't be broken by unexpected changes. It starts a full
screen browser window, sends several key events normally consumed by browser,
and checks whether these events are caught by the web page.

BUG=680809

Review-Url: https://codereview.chromium.org/2922773002
Cr-Commit-Position: refs/heads/master@{#486949}