Currently as a hidden class.
It can support many the animations now as far as ObjectAnimator and
hierarchical group can support.
And we don't have path morphing yet.
Also support the Animator / Interpolator inflation from Context and Resources.
Change-Id: I948bbdf7373ad291171eed0b497959dce8c2edf3
Rename the test from DynamicDrawableTest to VectorDrawableTest.
Remove duplicate function calls in the test.
Fix comments in VectorDrawable
Change-Id: I1ef87137088ccc10b1abdb40ca368345d9dbadab