Remove the animation stepping from WindowState and move it into a new class, WindowStateAnimator. Update all references to moved variables in related files. Change-Id: I7540d8f897b370c73975f3ffe450140861cb0cd1
Remove the animation stepping from WindowState and move it into a new class, WindowStateAnimator. Update all references to moved variables in related files. Change-Id: I7540d8f897b370c73975f3ffe450140861cb0cd1