Check state_focus in foreground.

This commit checks whether the state_focus is specified in the
foreground of a view. If it is, the default focus highlight won't
show up.

Test: cts-tradefed run singleCommand cts --skip-device-info
--skip-preconditions --abi armeabi-v7a -m CtsViewTestCases -t
android.view.cts.View_DefaultFocusHighlightTest#testIsDefaultFocusHighlightNeeded
Bug: 37288730
Change-Id: I5256eb656c1b8729d685edb914e867ee9a3a92a4