[Win, MediaGallery] Enumerate and handle mtp device attach/detach events.

chrome/browser/system_monitor/removable_device_notifications_window_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_REMOVABLE_DEVICE_NOTIFICATIONS_WINDOW_WIN_H_
 #define CHROME_BROWSER_SYSTEM_MONITOR_REMOVABLE_DEVICE_NOTIFICATIONS_WINDOW_WIN_H_
 
-#include <windows.h>
-
 #include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/system_monitor/system_monitor.h"
-#include "chrome/browser/system_monitor/volume_mount_watcher_win.h"
 
 class FilePath;
 
 namespace chrome {
 
+class PortableDeviceWatcherWin;
+class VolumeMountWatcherWin;
+
 class RemovableDeviceNotificationsWindowWin;
 typedef RemovableDeviceNotificationsWindowWin RemovableDeviceNotifications;
 
 class RemovableDeviceNotificationsWindowWin {
  public:
   // Creates an instance of RemovableDeviceNotificationsWindowWin. Should only
   // be called by browser start up code. Use GetInstance() instead.
   static RemovableDeviceNotificationsWindowWin* Create();
 
   virtual ~RemovableDeviceNotificationsWindowWin();
 
   // base::SystemMonitor has a lifetime somewhat shorter than a Singleton and
   // |this| is constructed/destroyed just after/before SystemMonitor.
   static RemovableDeviceNotificationsWindowWin* GetInstance();
 
   // Must be called after the file thread is created.
   void Init();
 
   // Finds the device that contains |path| and populates |device_info|.
   // Returns false if unable to find the device.
   bool GetDeviceInfoForPath(
       const FilePath& path,
       base::SystemMonitor::RemovableStorageInfo* device_info);
 
  private:
+  class PortableDeviceNotifications;
   friend class TestRemovableDeviceNotificationsWindowWin;
 
-  explicit RemovableDeviceNotificationsWindowWin(
-      VolumeMountWatcherWin* volume_mount_watcher);
+  // To support unit tests, this constructor takes |volume_mount_watcher| and
+  // |portable_device_watcher| objects. These params are either constructed in
+  // unit tests or in RemovableDeviceNotificationsWindowWin::Create() function.
+  RemovableDeviceNotificationsWindowWin(
+      VolumeMountWatcherWin* volume_mount_watcher,
+      PortableDeviceWatcherWin* portable_device_watcher);
 
   // Gets the removable storage information given a |device_path|. On success,
   // returns true and fills in |device_location|, |unique_id|, |name| and
   // |removable|.
   bool GetDeviceInfo(const FilePath& device_path,
                      string16* device_location,
                      std::string* unique_id,
                      string16* name,
                      bool* removable);
 
   static LRESULT CALLBACK WndProcThunk(HWND hwnd, UINT message, WPARAM wparam,
                                        LPARAM lparam);
 
   LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wparam,
                            LPARAM lparam);
 
   void OnDeviceChange(UINT event_type, LPARAM data);
 
   // The window class of |window_|.
   ATOM window_class_;
 
   // The handle of the module that contains the window procedure of |window_|.
   HMODULE instance_;
   HWND window_;
 
-  // Store the volume mount point watcher to manage the mounted devices.
+  // The volume mount point watcher, used to manage the mounted devices.
   scoped_refptr<VolumeMountWatcherWin> volume_mount_watcher_;
 
+  // The portable device watcher, used to manage media transfer protocol
+  // devices.
+  scoped_ptr<PortableDeviceWatcherWin> portable_device_watcher_;
+
   DISALLOW_COPY_AND_ASSIGN(RemovableDeviceNotificationsWindowWin);
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_SYSTEM_MONITOR_REMOVABLE_DEVICE_NOTIFICATIONS_WINDOW_WIN_H_