Delegate implementing the native methods of android.graphics.RadialGradient
Through the layoutlib_create tool, the original native methods of RadialGradient have been
replaced by calls to methods of the same name in this delegate class.
This class behaves like the original native implementation, but in Java, keeping previously
native data into its own objects and mapping them to int that are sent back and forth between
it and the original RadialGradient class.
Because this extends
Shader_Delegate, there's no need to use a
DelegateManager,
as all the Shader classes will be added to the manager owned by
Shader_Delegate.