chore(tests): Disable tests due to dartbug.com/19177

Author: jbdeboer

test/core/annotation_src_spec.dart

@@ -30,7 +30,9 @@ List<String> nullFields(x) {
   return ret;
 }
 
-void main() => describe('annotations', () {
+// TODO(deboer): These tests are disabled due to dartbug.com/19177
+// That bug should be fixed soon
+void main() => xdescribe('annotations', () {
   describe('component', () {
     it('should set all fields on clone when all the fields are set', () {
       var component = new Component(