[Chrome OS]Implement MediaStorageUtil::GetDeviceInfoForPath function to support media gallery permi…

chrome/browser/system_monitor/media_transfer_protocol_device_observer_chromeos.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_BROWSER_SYSTEM_MONITOR_MEDIA_TRANSFER_PROTOCOL_DEVICE_OBSERVER_CHROMEOS_H_
 #define CHROME_BROWSER_SYSTEM_MONITOR_MEDIA_TRANSFER_PROTOCOL_DEVICE_OBSERVER_CHROMEOS_H_
 
 #include <map>
 #include <string>
 
 #include "base/string16.h"
+#include "base/system_monitor/system_monitor.h"
 #include "chrome/browser/chromeos/mtp/media_transfer_protocol_manager.h"
 
+class FilePath;
+
+namespace chromeos {
+namespace mtp {
+class MediaTransferProtocolDeviceObserverCros;
+}  // namespace mtp
+}  // namespace chromeos
+
+namespace chrome {
+
+typedef class chromeos::mtp::MediaTransferProtocolDeviceObserverCros
+    MediaTransferProtocolDeviceObserver;
+
+}  // namespace chrome
+
 namespace chromeos {
 namespace mtp {
 
 // Gets the mtp device information given a |storage_name|. On success,
 // fills in |id|, |name| and |location|.
 typedef void (*GetStorageInfoFunc)(const std::string& storage_name,
                                    std::string* id,
                                    string16* name,
                                    std::string* location);
 
 // Helper class to send MTP storage attachment and detachment events to
 // SystemMonitor.
 class MediaTransferProtocolDeviceObserverCros
     : public MediaTransferProtocolManager::Observer {
  public:
+  // Should only be called by browser start up code. Use GetInstance() instead.
   MediaTransferProtocolDeviceObserverCros();
   virtual ~MediaTransferProtocolDeviceObserverCros();
 
+  static MediaTransferProtocolDeviceObserverCros* GetInstance();
+
+  // Finds the storage that contains |path| and populates |storage_info|.
+  // Returns false if unable to find the storage.
+  bool GetStorageInfoForPath(
+      const FilePath& path,
+      base::SystemMonitor::RemovableStorageInfo* storage_info) const;
+
  protected:
   // Only used in unit tests.
   explicit MediaTransferProtocolDeviceObserverCros(
       GetStorageInfoFunc get_storage_info_func);
 
   // MediaTransferProtocolManager::Observer implementation.
   // Exposed for unit tests.
   virtual void StorageChanged(bool is_attached,
                               const std::string& storage_name) OVERRIDE;
 
  private:
-  // Mapping of storage name and device id.
-  typedef std::map<std::string, std::string> StorageNameToIdMap;
+  // Mapping of storage location and mtp storage info object.
+  typedef std::map<std::string,
+                   base::SystemMonitor::RemovableStorageInfo>
+      StorageLocationToInfoMap;
 
   // Enumerate existing mtp storage devices.
   void EnumerateStorages();
 
   // Map of all attached mtp devices.
-  StorageNameToIdMap storage_map_;
+  StorageLocationToInfoMap storage_map_;
 
   // Function handler to get storage information. This is useful to set a mock
   // handler for unit testing.
   GetStorageInfoFunc get_storage_info_func_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaTransferProtocolDeviceObserverCros);
 };
 
 }  // namespace mtp
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_SYSTEM_MONITOR_MEDIA_TRANSFER_PROTOCOL_DEVICE_OBSERVER_CHROMEOS_H_