Show download progress in the taskbar icon for Windows Aura.

BUG=289286
TEST=as in bug

Review URL: https://codereview.chromium.org/86063002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237216 0039d316-1c4b-4281-b951-d872f2087c98
Upstreaming AppMenu.

Landing png resources needed for the AppMenu.

TBR=dtrainor@chromium.org
BUG=309517

Review URL: https://codereview.chromium.org/85653005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237217 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237217