cherry picked from commit c497c7aabe
Bug: 173940869
Test: atest FloatingMenuOpacityPreferenceControllerTest
Change-Id: I1fbe3157c93fef4611c3b9b13569c9b339e2898a
Merged-In: I1fbe3157c93fef4611c3b9b13569c9b339e2898a
cherry picked from commit c497c7aabe
Bug: 173940869
Test: atest FloatingMenuOpacityPreferenceControllerTest
Change-Id: I1fbe3157c93fef4611c3b9b13569c9b339e2898a
Merged-In: I1fbe3157c93fef4611c3b9b13569c9b339e2898a