Track emitted classes in incremental compiler.

dart/tests/try/web/incremental_compilation_update_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library trydart.incremental_compilation_update_test;
 
 import 'dart:html' hide
     Element;
 
 import 'dart:async' show
@@ skipping 1288 matching lines @@
 """,
             const <String>['v1']),
         const ProgramResult(
             r"""
 main() {
   ['v2'].forEach(print);
 }
 """,
             const <String>['v2']),
     ],
+
+    // Test that newly instantiated classes are handled correctly when there is
+    // more than one change.
+    const <ProgramResult>[
+        const ProgramResult(
+            r"""
+class A {
+  foo() {
+    print('Called foo');
+  }
+
+  bar() {
+    print('Called bar');
+  }
+}
+
+class B extends A {
+}
+
+main() {
+  new B().foo();
+}
+""",
+            const <String>['Called foo']),
+        const ProgramResult(
+            r"""
+class A {
+  foo() {
+    print('Called foo');
+  }
+
+  bar() {
+    print('Called bar');
+  }
+}
+
+class B extends A {
+}
+
+main() {
+  new B().foo();
+}
+""",
+            const <String>['Called foo']),
+        const ProgramResult(
+            r"""
+class A {
+  foo() {
+    print('Called foo');
+  }
+
+  bar() {
+    print('Called bar');
+  }
+}
+
+class B extends A {
+}
+
+main() {
+  new A().bar();
+}
+""",
+            const <String>['Called bar']),
+    ],
 ];
 
 void main() {
   listener.start();
 
   document.head.append(lineNumberStyle());
 
   summary = new SpanElement();
   document.body.append(new HeadingElement.h1()
       ..appendText("Incremental compiler tests")
@@ skipping 180 matching lines @@
   position: absolute;
   left: 0px;
   width: 3em;
   text-align: right;
   background-color: lightgoldenrodyellow;
 }
 ''');
   style.type = 'text/css';
   return style;
 }