(re-commit) Implement installation of the Chrome App Host.

chrome/installer/util/channel_info.h

Index: chrome/installer/util/channel_info.h
diff --git a/chrome/installer/util/channel_info.h b/chrome/installer/util/channel_info.h
index 9ceae3248f0d527d4b30663a4b96646244a32a8b..605b87ac602d26201bdcd03ec52673fe6f6ee587 100644
--- a/chrome/installer/util/channel_info.h
+++ b/chrome/installer/util/channel_info.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -57,6 +57,13 @@ class ChannelInfo {
   // modified.
   bool SetChromeFrame(bool value);
 
+  // Returns true if the -apphost modifier is present in the value.
+  bool IsAppHost() const;
+
+  // Adds or removes the -apphost modifier, returning true if the value is
+  // modified.
+  bool SetAppHost(bool value);
+
   // Returns true if the -multi modifier is present in the value.
   bool IsMultiInstall() const;