Layoutlib: use default nine patch classes.

Move away from using our own implementation of NinePatchDrawable.
Now use native delegate for a few methods of NinePatch.

The byte[] used to describe the 9-patch chunk is entirely controlled
by the delegate. Therefore, while the default version (JNI) use the
array as a representation of a C struct, this version uses the array
as a serialized version of NinePatchChunk.

A cache mechanism using SoftReferences allows us to not deserialize
the array every time rendering needs to access the chunk itself.

The Bridge-level cache mechanism for bitmaps and nine-patches as
changed. Since the new nine-patches doesn't hold the bitmap
data anymore (it's stored in a normal Android bitmap which
is cached itself through the cache), then the nine-patch cache
has been changed to only contain the nine patch chunk.

Also initialize the canvas with the display metrics to prepare
for correct scaling when density of the assets don't match the target
density.

Still to come: actual density support in the 9-patch drawing code.

Change-Id: Ibefcccf4432e1986e8436e0c41a0107741593536

0 files changed, 0 insertions, 0 deletions