Keep track of the list of currently mounted volumes in C++-side VolumeManager.

chrome/browser/chromeos/file_manager/volume_manager.h

 // Copyright 2013 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_BROWSER_CHROMEOS_FILE_MANAGER_VOLUME_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_FILE_MANAGER_VOLUME_MANAGER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 142 matching lines @@
       chromeos::disks::DiskMountManager::FormatEvent event,
       chromeos::FormatError error_code,
       const std::string& device_path) OVERRIDE;
 
   // Called on change to kExternalStorageDisabled pref.
   void OnExternalStorageDisabledChanged();
 
  private:
   void OnPrivetVolumesAvailable(
       const local_discovery::PrivetVolumeLister::VolumeList& volumes);
+  void DoMountEvent(chromeos::MountError error_code,
+                    const VolumeInfo& volume_info,
+                    bool is_remounting);
+  void DoUnmountEvent(chromeos::MountError error_code,
+                      const VolumeInfo& volume_info);
 
   Profile* profile_;
   drive::DriveIntegrationService* drive_integration_service_;
   chromeos::disks::DiskMountManager* disk_mount_manager_;
   scoped_ptr<MountedDiskMonitor> mounted_disk_monitor_;
   PrefChangeRegistrar pref_change_registrar_;
   ObserverList<VolumeManagerObserver> observers_;
   scoped_ptr<local_discovery::PrivetVolumeLister> privet_volume_lister_;
+
+  std::map<std::string, VolumeInfo> mounted_volumes_;
+
   DISALLOW_COPY_AND_ASSIGN(VolumeManager);
 };
 
 }  // namespace file_manager
 
 #endif  // CHROME_BROWSER_CHROMEOS_FILE_MANAGER_VOLUME_MANAGER_H_