Add InstallerDelegate for watching that a package gets installed

* Class monitors for when the given package has been installed on the device.

* Timeouts added to prevent this from spinning forever.

* Test runs the InstallerDelegate on a separate thread so the Handler events are processed instead of sitting idly.

* An attempt at using BroadcastReceivers was made to catch http://developer.android.com/reference/android/content/Intent.html#ACTION_PACKAGE_ADDED,
but the broadcast is fired when the package is added and not when the package finishes installing.

* Adds dfalcantara@ to OWNERs for app banners directories

NOTRY=true
BUG=341556
TEST=InstallerDelegateTest
R=yfriedman@chromium.org

Review URL: https://codereview.chromium.org/156013005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252189 0039d316-1c4b-4281-b951-d872f2087c98