FlutterAngleTexture invoke resize callback on size change, cleanup on destruction and call glFinish in RenderCallback

FlutterAngleTexture invoke resize callback on size change, cleanup on destruction and call glFinish in RenderCallback
move OpenGlTextureBuffer cleanup to destructor

windows/flutter_angle_texture.h

@@ -38,7 +38,8 @@ class FlutterAngleTexture {
         ID3D11DeviceContext* D3D11DeviceContext,
         EGLConfig eglConfig,
         EGLDisplay eglDisplay,
-        EGLContext eglContext
+        EGLContext eglContext,
+        std::function<void(size_t, size_t)> onResizeRequested
     );    
     ~FlutterAngleTexture();
 
@@ -55,6 +56,7 @@ class FlutterAngleTexture {
     uint32_t _height = 0;
     bool logged = false;
     std::shared_ptr<std::mutex> _renderMutex;
+    std::function<void(size_t, size_t)> _onResizeRequested;
 
     // Device
     ID3D11Device* _D3D11Device = nullptr;
@@ -68,6 +70,7 @@ class FlutterAngleTexture {
     EGLDisplay _eglDisplay = EGL_NO_DISPLAY;
     EGLContext _eglContext = EGL_NO_CONTEXT;
     EGLConfig _eglConfig = EGL_NO_CONFIG_KHR;
+    EGLSurface _eglSurface = EGL_NO_SURFACE;
     
     std::unique_ptr<FlutterDesktopGpuSurfaceDescriptor> _textureDescriptor = nullptr;