Test extension reloading behavior.

By testing the actual interaction with renderer processes and the
notification system, I can expose the fact that we're starting a whole
extra process and loading the extension around 3 times.


BUG=178542

Review URL: https://chromiumcodereview.appspot.com/13533007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@193974 0039d316-1c4b-4281-b951-d872f2087c98
10 files changed