Revert 285661 "Remove some dead app host code."

trunk/src/chrome/installer/setup/install.cc

 // 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.
 
 #include "chrome/installer/setup/install.h"
 
 #include <windows.h>
 #include <shlobj.h>
 #include <time.h>
 
 #include <string>
 
+#include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/numerics/safe_conversions.h"
 #include "base/path_service.h"
+#include "base/process/launch.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/win/shortcut.h"
 #include "base/win/windows_version.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_switches.h"
+#include "chrome/installer/launcher_support/chrome_launcher_support.h"
 #include "chrome/installer/setup/install_worker.h"
 #include "chrome/installer/setup/setup_constants.h"
 #include "chrome/installer/util/auto_launch_util.h"
 #include "chrome/installer/util/browser_distribution.h"
 #include "chrome/installer/util/create_reg_key_work_item.h"
 #include "chrome/installer/util/delete_after_reboot_helper.h"
 #include "chrome/installer/util/google_update_constants.h"
 #include "chrome/installer/util/helper.h"
 #include "chrome/installer/util/install_util.h"
 #include "chrome/installer/util/master_preferences.h"
@@ skipping 645 matching lines @@
            INSTALL_SHORTCUT_REPLACE_EXISTING :
            INSTALL_SHORTCUT_CREATE_EACH_IF_NO_SYSTEM_LEVEL);
 
   // Read master_preferences copied beside chrome.exe at install.
   MasterPreferences prefs(installation_root.AppendASCII(kDefaultMasterPrefs));
   base::FilePath chrome_exe(installation_root.Append(kChromeExe));
   CreateOrUpdateShortcuts(
       chrome_exe, chrome, prefs, CURRENT_USER, install_operation);
 }
 
+bool InstallFromWebstore(const std::string& app_code) {
+  base::FilePath app_host_path(chrome_launcher_support::GetAnyAppHostPath());
+  if (app_host_path.empty())
+    return false;
+
+  CommandLine cmd(app_host_path);
+  cmd.AppendSwitchASCII(::switches::kInstallFromWebstore, app_code);
+  VLOG(1) << "App install command: " << cmd.GetCommandLineString();
+  return base::LaunchProcess(cmd, base::LaunchOptions(), NULL);
+}
+
 }  // namespace installer