Add a method to remount all removable devices in DiskMountManager.

chromeos/disks/disk_mount_manager.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 CHROMEOS_DISKS_DISK_MOUNT_MANAGER_H_
 #define CHROMEOS_DISKS_DISK_MOUNT_MANAGER_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 147 matching lines @@
     void set_mount_path(const std::string& mount_path) {
       mount_path_ = mount_path;
     }
 
     void set_write_disabled_by_policy(bool disable) {
       write_disabled_by_policy_ = disable;
     }
 
     void clear_mount_path() { mount_path_.clear(); }
 
+    bool is_mounted() const { return !mount_path_.empty(); }
+
    private:
     std::string device_path_;
     std::string mount_path_;
     bool write_disabled_by_policy_;
     std::string system_path_;
     std::string file_path_;
     std::string device_label_;
     std::string drive_label_;
     std::string vendor_id_;
     std::string vendor_name_;
@@ skipping 109 matching lines @@
   // Unmounts a mounted disk.
   // |UnmountOptions| enum defined in chromeos/dbus/cros_disks_client.h.
   // When the method is complete, |callback| will be called and observers'
   // |OnMountEvent| will be raised.
   //
   // |callback| may be empty, in which case it gets ignored.
   virtual void UnmountPath(const std::string& mount_path,
                            UnmountOptions options,
                            const UnmountPathCallback& callback) = 0;
 
+  // Remounts mounted removable devices to change the read-only mount option.
+  // Devices that can be mounted only in its read-only mode will be ignored.
+  virtual void RemountAllRemovableDrives(chromeos::MountAccessMode mode) = 0;
+
   // Formats Device given its mount path. Unmounts the device.
   // Example: mount_path: /media/VOLUME_LABEL
   virtual void FormatMountedDevice(const std::string& mount_path) = 0;
 
   // Unmounts device_path and all of its known children.
   virtual void UnmountDeviceRecursively(
       const std::string& device_path,
       const UnmountDeviceRecursivelyCallbackType& callback) = 0;
 
   // Used in tests to initialize the manager's disk and mount point sets.
@@ skipping 21 matching lines @@
 
   // Returns a pointer to the global DiskMountManager instance.
   // Initialize() should already have been called.
   static DiskMountManager* GetInstance();
 };
 
 }  // namespace disks
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DISKS_DISK_MOUNT_MANAGER_H_