LayoutLib: fix Capabilities and getDimensionPixelSize

Commented out a Capability that is not in ADT 10.

BridgeTypedArray.getDimensionPixelSize shouldn't call
getDimension since most of the code is duplicated, and
it prevents use from properly detecting malformed attribute
values.

Change-Id: I005b17061590dc0668729af16e896fad815f1973