[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)
qokelate/google-toolbox-for-mac,qokelate/google-toolbox-for-mac,qokelate/google-toolbox-for-mac