[Author: dmaclach]
[Author: dmaclach]

Adds a simple key value animation class. CAAnimation doesn't really allow
you to animate things that aren't part of CALayers, and this gets us 90%
of the way there to being able to not have to subclass NSAnimation for every
animation we want to do.

R=mikemorton
DELTA=155  (155 added, 0 deleted, 0 changed)

git-svn-id: 741c308154f1e22deafec9707230e8b816ec4ca6@447 7dc7ac4e-7543-0410-b95c-c1676fc8e2a3

chao787/GTM-mirror,chao787/GTM-mirror,chao787/GTM-mirror