Add installer::SetupSingleton.

chrome/installer/util/installer_state.h

 // 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.
 
 #ifndef CHROME_INSTALLER_UTIL_INSTALLER_STATE_H_
 #define CHROME_INSTALLER_UTIL_INSTALLER_STATE_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 101 matching lines @@
 
   // A convenience method returning level() == SYSTEM_LEVEL.
   bool system_install() const;
 
   // A convenience method returning package_type() == MULTI_PACKAGE.
   bool is_multi_install() const;
 
   // The full path to the place where the operand resides.
   const base::FilePath& target_path() const { return target_path_; }
 
+  // Sets the value returned by target_path().
+  void set_target_path_for_testing(const base::FilePath& target_path) {
+    target_path_ = target_path;
+  }
+
   // True if the "msi" preference is set or if a product with the "msi" state
   // flag is set is to be operated on.
   bool is_msi() const { return msi_; }
 
   // True if the process is running at a reduced "background" priority.
   bool is_background_mode() const { return background_mode_; }
 
   // Indicate that the process is or is not running in the background.
   void set_background_mode(bool bg) { background_mode_ = bg; }
 
@@ skipping 135 matching lines @@
   bool background_mode_;
   bool verbose_logging_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InstallerState);
 };  // class InstallerState
 
 }  // namespace installer
 
 #endif  // CHROME_INSTALLER_UTIL_INSTALLER_STATE_H_