Expose ImageBitmap to (Window,Worker)

third_party/WebKit/LayoutTests/fast/canvas/resources/canvas-createImageBitmap-data-in-workers.js

 importScripts('../../../resources/js-test.js');
 
 self.jsTestIsAsync = true;
 
 description('Test createImageBitmap with data in workers.');
 
+var bitmapWidth;
+var bitmapHeight;
+
 self.addEventListener('message', function(e) {
-  createImageBitmap(e.data).then(function() {
+  createImageBitmap(e.data).then(function(imageBitmap) {
     testPassed('Promise fulfilled.');
+    bitmapWidth = imageBitmap.width;
+    bitmapHeight = imageBitmap.height;
+    shouldBe("bitmapWidth", "50");
+    shouldBe("bitmapHeight", "50");
     finishJSTest();
   }, function() {
     testFailed('Promise rejected.');
     finishJSTest();
   });
-});
+});