- Added a new custom PNG chunk that carries the layout padding ints. - Extract the padding ticks from .9.png images and store in the chunk. - Load the padding information at runtime into Bitmap and NinePatchDrawable. - The new chunk is ordered first so that it doesn't cause a problem in older versions of the platform. Bug: 6087201 Change-Id: I5de46167a1d44b3ec21065b0c165e594b1dc8399