Convert auto-brightness switch to a full screen UI.

Change-Id: Id5e5ec959201102a7c60372a441dc6813ceedbae
Merged-In: Id5e5ec959201102a7c60372a441dc6813ceedbae
Fixes: 69795935
Test: Existing conformance tests still pass (CodeInspectionTest,
      UniquePreferenceTest, manual search test)
9 files changed