Uploads the composited layer tree to the engine.
Actually causes the output of the rendering pipeline to appear on screen.
Source
void compositeFrame() { Timeline.startSync('Compositing'); try { ui.SceneBuilder builder = new ui.SceneBuilder(); layer.addToScene(builder, Offset.zero); ui.Scene scene = builder.build(); ui.window.render(scene); scene.dispose(); assert(() { if (debugRepaintRainbowEnabled) debugCurrentRepaintColor = debugCurrentRepaintColor.withHue(debugCurrentRepaintColor.hue + debugRepaintRainbowHueIncrement); return true; }); } finally { Timeline.finishSync(); } }