* Revert "Add flow test fixtures and tests (#13986)"
This reverts commit 620f5281b8.
* Revert "Dynamically determine whether to use offscreen surface based on need (#13976)"
This reverts commit a86ef94656.
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.
David Worsham
liyuqian
Chris Yang