[automerger skipped] Validate user-supplied tree URIs in DocumentsProvider...

[automerger skipped] Validate user-supplied tree URIs in DocumentsProvider calls am: eca247f2 am: 22a3dede -s ours

am skip reason: Change-Id I90fd1e62aa7dc333bf32eb80ccc5b181a1d54e41 with SHA-1 b9f4fb79 is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12513169

Change-Id: Ie04c7459507a9a17283bf329674b4a93aca51f83