Merge "DocumentsUI: Declare intents for App enumeration" into rvc-dev am: 5a192ad6 am: 78ce50f0 am: e1bfb58d am: eedfd08e

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/DocumentsUI/+/11860601

Change-Id: I0f9c72ec09d83e9be3d51d9fcaf3199ea591361d