Implement WebGL's commit on the main thread

third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-commit-invalid-call.html

Index: third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-commit-invalid-call.html
diff --git a/third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-commit-invalid-call.html b/third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-commit-invalid-call.html
index 8cc9d6d9170d79b0ade6670871cd3b1b8c833834..cf52baa70b18b675c444f2f904cd6329cccc32bb 100644
--- a/third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-commit-invalid-call.html
+++ b/third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-commit-invalid-call.html
@@ -28,6 +28,16 @@ test(function() {
     });
 }, "Calling OffscreenCanvas.commit() on main without transferControlToOffscreen throws exception.");
 
+test(function() {
+    var offscreenCanvas = new OffscreenCanvas(50, 50);
+    var gl = offscreenCanvas.getContext("webgl");
+    gl.clearColor(1.0, 0.0, 0.0, 1.0);
+    gl.clear(gl.COLOR_BUFFER_BIT);
+    assert_throws("InvalidStateError", function() {
+        gl.commit();
+    });
+}, "Calling WebGL's commit() on main without transferControlToOffscreen throws exception.");
+
 async_test(function() {
     var worker = makeWorker(document.getElementById("myWorker").textContent);
     worker.onmessage = this.step_func(function (e) {