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 44d3faee3abc84bad8d252ad88daed1ec6942b30..5c40ff800c921343c7bcee36b52dc15f1e479799 100644
--- a/chrome/installer/util/channel_info.h
+++ b/chrome/installer/util/channel_info.h
@@ -58,6 +58,13 @@ 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;