Initial GUI for VM service

runtime/bin/vmservice/client/packages/observatory/src/observatory_elements/json_view.dart

Index: runtime/bin/vmservice/client/packages/observatory/src/observatory_elements/json_view.dart
diff --git a/runtime/bin/vmservice/client/packages/observatory/src/observatory_elements/json_view.dart b/runtime/bin/vmservice/client/packages/observatory/src/observatory_elements/json_view.dart
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index 0000000000000000000000000000000000000000..74478c0b29fdeca367fc740903bd8d025a5278f2
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+++ b/runtime/bin/vmservice/client/packages/observatory/src/observatory_elements/json_view.dart
@@ -0,0 +1,56 @@
+// 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 json_view_element;
+
+import 'package:polymer/polymer.dart';
+import 'observatory_element.dart';
+
+@CustomTag('json-view')
+class JsonViewElement extends ObservatoryElement {
+  @published dynamic get json => __$json; dynamic __$json = null; set json(dynamic value) { __$json = notifyPropertyChange(#json, __$json, value); }
+  var _count = 0;
+
+  JsonViewElement() : super() {
+  }
+
+  void jsonChanged(oldValue) {
+    notifyProperty(this, #valueType);
+  }
+
+  String get primitiveString {
+    return json.toString();
+  }
+
+  String get valueType {
+    if (json is Map) {
+      return 'Map';
+    } else if (json is List) {
+      return 'List';
+    }
+    return 'Primitive';
+  }
+
+  int get counter {
+    return _count++;
+  }
+
+  List get list {
+    if (json is List) {
+      return json;
+    }
+    return [];
+  }
+
+  List get keys {
+    if (json is Map) {
+      return json.keys.toList();
+    }
+    return [];
+  }
+
+  dynamic value(String key) {
+    return json[key];
+  }
+}