a11Y for select all button

Add content description for select all button.

Screenshot: http://screen/kmYYExHOuTp
Bug: 63917180
Test: Manual, refer to screenshot
PiperOrigin-RevId: 164672361
Change-Id: If34f754f68824664270d7a76b1cb17da2f8ef01c
1 file changed
tree: 5a4791dd7d81815c4f24265cd4309395913fee73
  1. assets/
  2. java/
  3. Android.mk
  4. AndroidManifest.xml
  5. LICENSE