Enable "Add to home screen" on Android.

Also restore a screen shot whose purpose I had forgotten.

R=johnniwinther@google.com

Review URL: https://codereview.chromium.org//140153002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@31889 260f80e4-7a28-3924-810f-c04153c831b5
5 files changed