[Media Gallery] Added code to support mtp device media file system on Windows.

chrome/browser/system_monitor/portable_device_watcher_win.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_PORTABLE_DEVICE_WATCHER_WIN_H_
 #define CHROME_BROWSER_SYSTEM_MONITOR_PORTABLE_DEVICE_WATCHER_WIN_H_
 
 #include <portabledeviceapi.h>
 
 #include <map>
@@ skipping 20 matching lines @@
 // operates on the UI thread, except for long running tasks it spins off to a
 // SequencedTaskRunner.
 class PortableDeviceWatcherWin {
  public:
   typedef std::vector<string16> StorageObjectIDs;
 
   struct DeviceStorageObject {
     DeviceStorageObject(const string16& temporary_id,
                         const std::string& persistent_id);
 
-    // Storage object temporary identifier, e.g. "s10001".
+    // Storage object temporary identifier, e.g. "s10001". This string ID
+    // uniquely identifies the object on the device. This ID need not be
+    // persistent across sessions. This ID is obtained from WPD_OBJECT_ID
+    // property.
     string16 object_temporary_id;
 
     // Storage object persistent identifier,
     // e.g. "StorageSerial:<SID-{10001,D,31080448}>:<123456789>".
     std::string object_persistent_id;
   };
   typedef std::vector<DeviceStorageObject> StorageObjects;
 
   // Struct to store attached MTP device details.
   struct DeviceDetails {
@@ skipping 12 matching lines @@
   virtual ~PortableDeviceWatcherWin();
 
   // Must be called after the browser blocking pool is ready for use.
   // RemovableDeviceNotificationsWindowsWin::Init() will call this function.
   void Init(HWND hwnd);
 
   // Processes DEV_BROADCAST_DEVICEINTERFACE messages and triggers a
   // SystemMonitor notification if appropriate.
   void OnWindowMessage(UINT event_type, LPARAM data);
 
+  // Gets the information of the MTP storage specified by |storage_device_id|.
+  // On success, returns true and fills in |device_location| with device
+  // interface details and |storage_object_id| with storage object temporary
+  // identifier.
+  bool GetMTPStorageInfoFromDeviceId(const std::string& storage_device_id,
+                                     string16* device_location,
+                                     string16* storage_object_id);
+
  private:
   friend class TestPortableDeviceWatcherWin;
 
   // Key: MTP device storage unique id.
   // Value: Metadata for the given storage.
   typedef std::map<std::string, base::SystemMonitor::RemovableStorageInfo>
       MTPStorageMap;
 
   // Key: MTP device plug and play ID string.
   // Value: Vector of device storage objects.
@@ skipping 27 matching lines @@
 
   // Used by |media_task_runner_| to create cancelable callbacks.
   base::WeakPtrFactory<PortableDeviceWatcherWin> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PortableDeviceWatcherWin);
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_SYSTEM_MONITOR_PORTABLE_DEVICE_WATCHER_WIN_H_