Add MacOS content_shell download to homebrew formula update app.

tools/apps/update_homebrew/bin/update_homebrew.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 update_homebrew;
 
 import 'dart:io';
 import 'dart:convert';
 import 'dart:async';
 import 'package:http/http.dart' as http;
 import 'package:args/args.dart';
 import 'package:googleapis/storage/v1.dart' as storage;
 import 'package:googleapis/common/common.dart' show DownloadOptions, Media;
 
 String repository;  // The path to the temporary git checkout of dart-homebrew.
 Map gitEnvironment;  // Pass a wrapper script for SSH to git in the environment.
 
 final CHANNELS = ['dev', 'stable'];
 
 final SDK_FILES = ['sdk/dartsdk-macos-x64-release.zip',
                    'sdk/dartsdk-macos-ia32-release.zip' ];
-final DARTIUM_FILES = ['dartium/dartium-macos-ia32-release.zip' ];
+final DARTIUM_FILES = ['dartium/dartium-macos-ia32-release.zip',
+                       'dartium/content_shell-macos-ia32-release.zip'];
 final FILES = []..addAll(SDK_FILES)..addAll(DARTIUM_FILES);
 
 
 Future<String> getHash256(String channel, int revision, String download) {
   var client = new http.Client();
   var api = new storage.StorageApi(client);
   return
       api.objects.get('dart-archive',
                       'channels/$channel/release/$revision/$download.sha256sum',
                        downloadOptions: DownloadOptions.FullMedia)
@@ skipping 66 matching lines @@
       .close();
   });
 }
 
 String DartiumFile(Map revisions,
                    Map hashes,
                    String devVersion,
                    String stableVersion) {
   final urlBase = 'https://storage.googleapis.com/dart-archive/channels';
   final dartiumFile = 'dartium/dartium-macos-ia32-release.zip';
+  final contentShellFile = 'dartium/content_shell-macos-ia32-release.zip';
 
   return '''
 require 'formula'
 
 class Dartium < Formula
   homepage "https://www.dartlang.org"
 
   version '$stableVersion'
   url '$urlBase/stable/release/${revisions['stable']}/$dartiumFile'
   sha256 '${hashes['stable'][dartiumFile]}'
 
   devel do
     version '$devVersion'
     url '$urlBase/dev/release/${revisions['dev']}/$dartiumFile'
     sha256 '${hashes['dev'][dartiumFile]}'
+
+    resource 'content_shell' do
+      url '$urlBase/dev/release/${revisions['dev']}/$contentShellFile'
+      version '$devVersion'
+      sha256 '${hashes['dev'][contentShellFile]}'
+    end
+  end
+
+  resource 'content_shell' do
+    url '$urlBase/stable/release/${revisions['stable']}/$contentShellFile'
+    version '$stableVersion'
+    sha256 '${hashes['stable'][contentShellFile]}'
   end
 
   def shim_script target
     <<-EOS.undent
       #!/bin/bash
-      open "#{prefix}/#{target}" "\$@"
+      "#{prefix}/#{target}" "\$@"
     EOS
   end
 
   def install
+    dartium_binary = 'Chromium.app/Contents/MacOS/Chromium'
     prefix.install Dir['*']
-    (bin+"dartium").write shim_script "Chromium.app"
+    (bin+"dartium").write shim_script dartium_binary
+
+    content_shell_binary = 'Content Shell.app/Contents/MacOS/Content Shell'
+    prefix.install resource('content_shell')
+    (bin+"content_shell").write shim_script content_shell_binary
   end
 
   def caveats; <<-EOS.undent
      To use with IntelliJ, set the Dartium execute home to:
         #{prefix}/Chromium.app
     EOS
   end
 
   test do
     system "#{bin}/dartium"
@@ skipping 93 matching lines @@
         repository = tempDir.path;
       })
       .then((_) => runGit(
           ['clone', 'git@github.com:dart-lang/homebrew-dart.git', '.']))
       .then((_) => writeHomebrewInfo(channel, revision))
       .then((_) => runGit(['commit', '-a', '-m',
                            'Updated $channel branch to revision $revision']))
       .then((_) => runGit(['push']))
       .whenComplete(() => new Directory(repository).delete(recursive: true));
 }