KeyChain: Start supporting user-selectability of keys.

This change makes the AliasLoader filter out aliases for keys that are
not user-selectable.

This is the beginning of the work to enable controlling access to
DPC-installed keys in KeyChain.

Bug: 65624467
Test: New unit tests.
Change-Id: Ie829bfdbd31c4738702bef661d00064c691143c7
3 files changed
tree: d3c4e0c1b8be0afd7c5ff67849f133867eb85e04
  1. res/
  2. robotests/
  3. src/
  4. support/
  5. tests/
  6. Android.mk
  7. AndroidManifest.xml