Add an infobar if a session is being controlled by an automated test. This infobar is only displayed if the browser is launched with the --enable-automation switch. It also disables the developer mode extensions warning bubble. Design doc: https://docs.google.com/document/d/1JYj9K61UyxIYavR8_HATYIglR9T_rDwAtLLsD3fbDQg/edit BUG=chromedriver:1625 TEST=launch with and without --enable-automation, and check for presence of automation infobar Review-Url: https://codereview.chromium.org/2564973002 Cr-Commit-Position: refs/heads/master@{#450257} 
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