XML metadata for storage backend; custom icons.

Introduce XML metadata for storage backends, used to indicate if
custom roots should be queried, and provide any custom MIME type
icons inside that backend.

Parse metadata and resolve custom icons in UI.

Change-Id: Iec026c0b10845edff7a345d9389691ddf2c87a0e
4 files changed
tree: a74c8056121339ccb6c5af583c955cd7187e02c7
  1. res/
  2. src/
  3. Android.mk
  4. AndroidManifest.xml