Null check

Change-Id: Iace51ac973908b5ac8b749b689d3fb360834fd60
Update wallpapers

Change-Id: I7b35d523dd64c8503d8cde32c645960538d3c238
Revert "Update wallpapers"

This reverts commit 2baac8d45492d32f909c6dcd29e133bda30f792a.
Restore 720dp wallpapers

Change-Id: Ibafa9195ac3ac2e4666a35a6fe8f059d5798ee87
Simplified default workspace

Change-Id: I2fc577cc1a74e35ad115d65079a43632df248070
Max widget grid size and hotseat cell width

Change-Id: I40e267c8d3cf9f83f91f495b65916fa3d7068435
Improve scroll responsiveness.

1) mUsePagingTouchSlop set to false.
   Applist scroll now scrolls with the same
   thresholds used by homescreen scrolling.

2) Early start of scroll as soon as we
   detect that it's okay to scroll.
   Eliminates waiting for next vsync
   and starts scrolling in the current cycle.
   instead of the next.

Above changes help in reducing first touch to
first displacement latencies in scroll usecases.
Improves scroll responsiveness.

Change-Id: Ib45a361b9b6275e64d0a5b5603aa15fdd386a5f8
Change default workspace for 720dp; disable clings

Change-Id: I95ccbb9b303f80c43a4d7675d117078d8e12a412
Set default checkbox status for dock on bottom

Change-Id: I5acdee2978f1210af1f77c3d0898cd5b850a361e