Add Google Charts to Observatory and use it in allocation profiler

runtime/bin/vmservice/client/web/main.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.
+
+import 'package:logging/logging.dart';
+import 'package:observatory/observatory.dart';
+import 'package:polymer/polymer.dart';
+
+main() {
+  Logger.root.level = Level.INFO;
+  Logger.root.onRecord.listen((LogRecord rec) {
+    print('${rec.level.name}: ${rec.time}: ${rec.message}');
+  });
+  Logger.root.info('Starting Observatory');
+  GoogleChart.initOnce().then((_) {
+    // Charts loaded, initialize polymer.
+    Logger.root.info('Initializing Polymer');
+    initPolymer();
+  });
+}