Support for Gradient Fill Colors

I have the following Vector Drawable..

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```

Unfortunately, since the ```fillColor``` is set to a gradient in the ```fillColorPath``` path, ```PathModel.getFillColor``` returns 0, which is incorrect. I'm gathering this is not supported?

The issue points to PathModel.getFillColor and the fillColorPath gradient in the supplied Vector Drawable. Start by tracing how that gradient is parsed and represented; done means gradient fills are supported without getFillColor returning 0, with the supplied drawable used to verify the behavior.

Written by the indexing model from the issue text.