Overview comes in and workspace goes out at overshoot(1.2), so
the wallpaper depth/blur should match that speed.
Test: go to overview from home in 3 button or 0 button mode,
ensure wallpaper scales down at the same rate as other elements
Bug: 154637581
Change-Id: I03254fa3fdf19f468852bed8aab7ba21203c429a
This is caused because we use mDepth for depth comparisons, but there are
cases where we set mDepth but we do not pass that value to WallpaperManager
(ie. surface is null or not valid) and that leads us into
inconsistent states.
Bug: 155780358
Change-Id: I3faf14416d5783ad472892425eb0bd37dd469a46
We use this flag to prevent the depth from being immediately set to 0 when
preparing to animate home.
Bug: 152327671
Change-Id: I614c6ae08b9f9e56ecb94fb51748791a38504583