ensureFrameCallbacksRegistered method
override
Ensures callbacks for PlatformDispatcher.onBeginFrame and PlatformDispatcher.onDrawFrame are registered.
Implementation
@override
void ensureFrameCallbacksRegistered() {
// Leave PlatformDispatcher alone, do nothing.
assert(platformDispatcher.onDrawFrame == null);
assert(platformDispatcher.onBeginFrame == null);
}