Fix janky multi-window entry animation

- Add tracing when drawing ImageWallpaper.
- Don't force a redraw in onSurfaceRedrawNeeded. This only adds
another unnecessary draw and doesn't do anything useful.
onSurfaceRedrawNeeded is only here so the client can block.
- Delay entrance animation by one frame so wallpaper can be drawn
before the transition is starting.
- Add some delay for animating the tasks up in recents to match that
delay (it wasn't matched before at all).
- Fix an issue where launchedFromHome was wrong while docking.

Bug: 28769940
Change-Id: I2b763ed40078541328a1e04ffecf5b0a520fe019