homebrew: Include version information in resources

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:async';
 import 'dart:convert';
 import 'dart:io';
 
@@ skipping 187 matching lines @@
     version '$devVersion'
     if MacOS.prefer_64_bit?
       url '$urlBase/dev/release/${revisions['dev']}/$x64File'
       sha256 '${hashes['dev'][x64File]}'
     else
       url '$urlBase/dev/release/${revisions['dev']}/$ia32File'
       sha256 '${hashes['dev'][ia32File]}'
     end
 
     resource 'content_shell' do
+      version '$devVersion'
       url '$urlBase/dev/release/${revisions['dev']}/$contentShellFile'
       sha256 '${hashes['dev'][contentShellFile]}'
     end
 
     resource 'dartium' do
+      version '$devVersion'
       url '$urlBase/dev/release/${revisions['dev']}/$dartiumFile'
       sha256 '${hashes['dev'][dartiumFile]}'
     end
   end
 
   resource 'content_shell' do
+    version '$stableVersion'
     url '$urlBase/stable/release/${revisions['stable']}/$contentShellFile'
     sha256 '${hashes['stable'][contentShellFile]}'
   end
 
   resource 'dartium' do
+    version '$stableVersion'
     url '$urlBase/stable/release/${revisions['stable']}/$dartiumFile'
     sha256 '${hashes['stable'][dartiumFile]}'
   end
 
   def install
     libexec.install Dir['*']
     bin.install_symlink "#{libexec}/bin/dart"
     bin.write_exec_script Dir["#{libexec}/bin/{pub,docgen,dart?*}"]
 
     if build.with? 'content-shell'
@@ skipping 85 matching lines @@
 
       await runGit(['push']);
     } finally {
       await tempDir.delete(recursive: true);
     }
   }, onError: (error, chain) {
     print(error);
     print(chain.terse);
   });
 }