Mutate the drawable if a valid state change happen

In another word, create another cached bitmap, when the current VectorDrawable
will look differently when state changed.

Bug: 29870392
Bug: 29854240

Change-Id: I7a5ef91091e547a930368286defc7ab96aeb9471
(cherry picked from commit 4f1acfb5f507798daaff2ff0da47d2b15607ded4)
1 file changed