Richard Cai cb35e23e34 (MacOS) Add FlutterGLCompositor with support for rendering multiple layers (flutter/engine#22782)
* Create FlutterGLCompositor.
* Add additional state to manage frame status and CALayers to FlutterGLCompositor

FlutterGLCompositor supports rendering multiple layers. The first layer is rendered using the FlutterView. Additional CALayers are created if there is more than one layer.

Platform view support will be added in following PR.
2020-12-03 11:57:15 -05:00
..