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- Move showing, dimissing, animation observer, click monitoring code tha into an AppList controller in aura_shell;
- Change ShellDelegate::ShowApps to an inteface to request app list widget and having a callback to notify app list controller when the widget is ready;
- Click outside to dismiss the window.
- Hide default container when app list is visible;

BUG=98308
TEST=Verify click outside applist window to dismiss it. Browser windows should be hidden when app list window is shown and should be visible when app list is gone.


Review URL: http://codereview.chromium.org/8558031

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@111021 0039d316-1c4b-4281-b951-d872f2087c98