Reject promise with InvalidStateError instead of null in createImageBitmap(Blob)

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

 importScripts('../../../resources/js-test.js');
 
 self.jsTestIsAsync = true;
 
 description('Test createImageBitmap with invalid blobs in workers.');
 
 self.addEventListener('message', function(e) {
   createImageBitmap(e.data).then(function() {
     testFailed('Promise fulfuilled.');
     finishJSTest();
-  }, function() {
-    testPassed('Promise rejected.');
+  }, function(ex) {
+    testPassed('Promise rejected: ' + ex);
     finishJSTest();
   });
-});
+});