Chris Yang cc04914ab4 Add onUnregistered callback in 'Texture' and 'FlutterTexture' (flutter/engine#12695)
Texture unregistration is finished on the GPU thread. The FlutterTexture implementation might not know when it is finished which leads to a race condition. Adding this callback so the FlutterTexture is aware of end of the unregistration process.
2019-10-08 12:45:57 -07:00
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