haodong 8fbc2e02e9 [ProgressIndicator] Added the custom drawable support (6/7)
- Integrated new animator delegate classes to ProgressIndicator.
- Removed the replaced drawable classes.
- Added getPreferredSize function to drawing delegate interface.
- Added new indicator type CUSTOM.
- Fixed some potential NPE logics.

PiperOrigin-RevId: 318197464
2020-06-26 14:10:32 -04:00
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