KeyChain: Adding user-selectability tests

Add a test exercising isUserSelectable/setUserSelectable.

Since setting user-selectability is privileged to system callers,
add a method to the key chain service test support service for doing
so.

Bug: 138375478
Test: atest KeyChainTests
Change-Id: Iacd4a04115c6ea354a0abf8e1092c1417761f233
3 files changed
tree: 36e52d799d2a0d5045893e6f7645d4775e4f4c94
  1. res/
  2. robotests/
  3. src/
  4. support/
  5. tests/
  6. Android.bp
  7. AndroidManifest.xml
  8. OWNERS