Allow to create read only testing volumes.

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 <map>
 #include <string>
 #include <vector>
@@ skipping 158 matching lines @@
                           VolumeInfo* result) const;
 
   // For testing purpose, registers a native local file system pointing to
   // |path| with DOWNLOADS type, and adds its volume info.
   bool RegisterDownloadsDirectoryForTesting(const base::FilePath& path);
 
   // For testing purpose, adds a volume info pointing to |path|, with TESTING
   // type. Assumes that the mount point is already registered.
   void AddVolumeInfoForTesting(const base::FilePath& path,
                                VolumeType volume_type,
-                               chromeos::DeviceType device_type);
+                               chromeos::DeviceType device_type,
+                               bool read_only);
 
   // drive::DriveIntegrationServiceObserver overrides.
   void OnFileSystemMounted() override;
   void OnFileSystemBeingUnmounted() override;
 
   // chromeos::disks::DiskMountManager::Observer overrides.
   void OnDiskEvent(
       chromeos::disks::DiskMountManager::DiskEvent event,
       const chromeos::disks::DiskMountManager::Disk* disk) override;
   void OnDeviceEvent(chromeos::disks::DiskMountManager::DeviceEvent event,
@@ skipping 48 matching lines @@
 
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<VolumeManager> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(VolumeManager);
 };
 
 }  // namespace file_manager
 
 #endif  // CHROME_BROWSER_CHROMEOS_FILE_MANAGER_VOLUME_MANAGER_H_