Add measurements and send-metrics to dart2js's info.

bin/inference/server.dart

+// Copyright (c) 2015, 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.
+
+/// Server component to display inference results using a web app.
+library dart2js_info.bin.inference.server;
+
+import 'dart:io';
+import 'package:shelf/shelf.dart' as shelf;
+import 'package:shelf/shelf_io.dart' as shelf;
+import 'package:shelf_static/shelf_static.dart' as shelf_static;
+
+String jsonDataFile;
+String indexFile;
+String scriptFile;
+
+main(args) async {
+  var host = 'localhost';
+  var port = 8080;
+
+  jsonDataFile = args.length > 0 ? args[0] : 'out.js.stats.json';
+  indexFile = Platform.script.resolve('index.html').path;
+  scriptFile = Platform.script.resolve('client.dart.js').path;
+
+  await shelf.serve(_handler, host, port);
+}
+
+_handler(shelf.Request request) async {
+  var path = request.url.path;
+  if (path == 'data') {
+    return new shelf.Response.ok(await new File(jsonDataFile).readAsString());
+  }
+  if (path == 'client.dart.js') {
+    return new shelf.Response.ok(await new File(scriptFile).readAsString(),
+        headers: JS_HEADERS);
+  }
+  if (path.startsWith('file/')) {
+    return _fileHandler(request.change(path: 'file'));
+  }
+  return new shelf.Response.ok(await new File(indexFile).readAsString(),
+      headers: HTML_HEADERS);
+}
+
+final _fileHandler = shelf_static.createStaticHandler('/');
+const HTML_HEADERS = const {'content-type': 'text/html'};
+const JS_HEADERS = const {'content-type': 'text/javascript'};