Tony Wickham d683d98b34 Animate taskbar background alpha and visibility alpha
Setup codepath to animate the Taskbar when going to and from Launcher,
primarily by listening for pause/resume signals but also hints from
gesture nav and AppToOverviewAnimationProvider.

Additionally, add TaskbarStateHandler to listen for Launcher state
changes if Taskbar is enabled. Combined, the end behavior is:

- Background alpha is 0 when Launcher is resumed, and 1 when Launcher
  is paused (we can make this animation more interesting later).
- Taskbar is always visible when Launcher is paused, otherwise its
  visibility is determined by multiple factors: LauncherState and
  whether the IME is showing.

Bug: 171917176
Change-Id: I7856fc979931c9d12d714dee11d179fd1b5a6968
2021-01-29 21:22:00 +00:00
2019-11-25 20:24:07 +09:00
2020-10-26 17:00:36 -07:00
2020-07-27 09:54:47 -07:00
2020-01-17 11:24:43 -08:00
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