[1/2] Base: Quick pulldown

This adds an option to toggle between left, right & centre.
left is the 30% from left, right is 30% from right &
centre is 40% in the middle.

Change-Id: I258421ff453b5525c7cfcd83ef36b452673072ef
Merge "[1/2] Base: Quick pulldown" into android-4.4
Merge remote-tracking branch 'cm/android-4.4' into android-4.4