[Memory Leak] Fix leak of LauncherAppWidgetHostView via StateManager.StateListener

Rather than register a StateListener for each LauncherAppWidgetHostView, just register one StateListener which, upon launcher state is changed to NORMAL, iterate over all child views under Workspace and perform a11y action if view tag is set.

Fix: 397978703
Test: presubmit
Flag: EXEMPT bug fix
Change-Id: I044d012b74eaa5356196c5503318fa8ab389ec46
3 files changed