jasonwshsu 5154c4cfae Handle the basic logic to show or hide accessibility floating menu
* AccessibilityFloatingMenuController will listen to the changes from AccessibilityButtonTargetsObserver and AccessibilityButtonModeObserver then handle the visibility of FloatingMenu
* Add abstract class SecureSettingsContentObserver to handle a registry of listeners of specific types and dispatch changes to child

Cherry picked from commit 523514fd24

Bug: 173940864
Test: atest AccessibilityButtonTargetsObserverTest AccessibilityButtonModeObserverTest AccessibilityFloatingMenuControllerTest
Change-Id: I07fded55340644bce84a3f17a7a4da950268d2d2
Merged-In: I07fded55340644bce84a3f17a7a4da950268d2d2
2021-03-19 13:40:45 +08:00
2021-03-15 12:32:58 +00:00
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