Create a ClipArea class to handle tracking clip regions. This class can
select the most efficient implementation depending on the types of
clipping presented.
ClipArea re-used the rectangle and region-based clipping
implementations as well as adding a "list of rotated rectangles"
approach that is more efficient for rotated views with children.
Change-Id: I2133761a2462ebc0852b394220e265974b3086f0
Bug: 16712006
Initial work towards benchmarking HWUI systems
Currently this will just create a screen full of
"cards" to simulate a high load scenario for
shadows and clipping
Change-Id: Ie9f9a9570844e136db8053e8fc62fe06cb922a5f
