Disallow resizing on OffscreenCanvas that has been transferred control from canvas

third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-transferControlToOffscreen.html

Index: third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-transferControlToOffscreen.html
diff --git a/third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-transferControlToOffscreen.html b/third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-transferControlToOffscreen.html
index a093f1e871a9866a67e6cc49315c85d3fdce81ab..e881b63c0d1e52d926029c1165e6cee65f3e4559 100644
--- a/third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-transferControlToOffscreen.html
+++ b/third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-transferControlToOffscreen.html
@@ -42,11 +42,9 @@ test(function() {
     var offscreenCanvas3 = canvas3.transferControlToOffscreen();
     assert_equals(offscreenCanvas3.width, 10);
     assert_equals(offscreenCanvas3.height, 10);
-    offscreenCanvas3.width = 20;
-    offscreenCanvas3.height = 20;
-    assert_equals(offscreenCanvas3.width, 10);
-    assert_equals(offscreenCanvas3.height, 10);
-}, "Test if resizing on offscreencanvas transferred from html canvas has no effect");
+    assert_throws("InvalidStateError", function() { offscreenCanvas3.width = 20; });
+    assert_throws("InvalidStateError", function() { offscreenCanvas3.height = 20; });
+}, "Test if resizing on offscreencanvas transferred from html canvas has thrown exceptions.");
 
 </script>
 </body>