Add ClassDeclaration/ClassTypeAlias.isAbstract() and use them.

editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/ast/ClassTypeAliasTest.java

 /*
  * Copyright (c) 2014, the Dart project authors.
  * 
  * Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
  * in compliance with the License. You may obtain a copy of the License at
  * 
  * http://www.eclipse.org/legal/epl-v10.html
  * 
  * Unless required by applicable law or agreed to in writing, software distributed under the License
  * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
  * or implied. See the License for the specific language governing permissions and limitations under
  * the License.
  */
-package com.google.dart.engine.element.angular;
+package com.google.dart.engine.ast;
 
-import com.google.dart.engine.ExtendedTestSuite;
+import com.google.dart.engine.parser.ParserTestCase;
+import com.google.dart.engine.scanner.Keyword;
 
-import junit.framework.Test;
-import junit.framework.TestSuite;
+import static com.google.dart.engine.ast.AstFactory.classTypeAlias;
 
-public class TestAll {
-  public static Test suite() {
-    TestSuite suite = new ExtendedTestSuite("Tests in " + TestAll.class.getPackage().getName());
-    suite.addTestSuite(AngularPropertyKindTest.class);
-    return suite;
+public class ClassTypeAliasTest extends ParserTestCase {
+  public void test_isAbstract() throws Exception {
+    assertFalse(classTypeAlias("A", null, null, null, null, null).isAbstract());
+    assertTrue(classTypeAlias("B", null, Keyword.ABSTRACT, null, null, null).isAbstract());
   }
 }