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1. Add the resource to chrome.exe so that omaha can use it for app commands.
2. Make extension install not prompt because the window launches behind the
current window (along with other problems) which results in a bad user experience.

Note that the only code path touched is strictly only hit by the limited install from
webstore code path.


TESTED=The unit test and tested the functionality using a test page which calls the app command.
BUG=233783

Review URL: https://chromiumcodereview.appspot.com/14381004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@195393 0039d316-1c4b-4281-b951-d872f2087c98