Implement installation of the Chrome App Host.

chrome/installer/util/util_constants.cc

Index: chrome/installer/util/util_constants.cc
diff --git a/chrome/installer/util/util_constants.cc b/chrome/installer/util/util_constants.cc
index cc444be44a114910065a4a81dabecbdca40fc71e..8d3f8740f0789f1bb290f4a3abdf884d99092d12 100644
--- a/chrome/installer/util/util_constants.cc
+++ b/chrome/installer/util/util_constants.cc
@@ -15,6 +15,9 @@ const char kAutoLaunchChrome[] = "auto-launch-chrome";
 // Currently this is only required when used in combination with kMultiInstall.
 const char kChrome[] = "chrome";
 
+// Install Chrome App Host.
+const char kChromeAppHost[] = "app-host";
+
 // Install Chrome Frame.
 const char kChromeFrame[] = "chrome-frame";
 
@@ -161,6 +164,7 @@ const char kToastResultsKey[] = "toast-results-key";
 
 }  // namespace switches
 
+const wchar_t kChromeAppHostExe[] = L"app_host.exe";
 const wchar_t kChromeDll[] = L"chrome.dll";
 const wchar_t kChromeExe[] = L"chrome.exe";
 const wchar_t kChromeFrameDll[] = L"npchrome_frame.dll";