Постоянная CONTEXT_LOST_WEBGL
Реализация
static const int CONTEXT_LOST_WEBGL = 0x9242;
© 2012 the Dart project authors
Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.18.5/dart-web_gl/WebGL/CONTEXT_LOST_WEBGL-constant.html
