Begin implementing a debugger page in Observatory.

runtime/bin/vmservice/observatory/lib/src/elements/stack_frame.dart

Index: runtime/bin/vmservice/observatory/lib/src/elements/stack_frame.dart
diff --git a/runtime/bin/vmservice/observatory/lib/src/elements/stack_frame.dart b/runtime/bin/vmservice/observatory/lib/src/elements/stack_frame.dart
deleted file mode 100644
index 489c3670a0332107a8fb402dc9b5f5912bf6c7c0..0000000000000000000000000000000000000000
--- a/runtime/bin/vmservice/observatory/lib/src/elements/stack_frame.dart
+++ /dev/null
@@ -1,24 +0,0 @@
-// Copyright (c) 2013, 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 stack_frame_element;
-
-import 'observatory_element.dart';
-import 'package:polymer/polymer.dart';
-
-@CustomTag('stack-frame')
-class StackFrameElement extends ObservatoryElement {
-  @published ObservableMap frame;
-  @published bool expand = false;
-  StackFrameElement.created() : super.created();
-
-  dynamic expander() {
-    return expandEvent;
-  }
-
-  void expandEvent(bool exp, var done) {
-    expand = exp;
-    done();
-  }
-}