Add notification for media changed, and notify volume mount watcher when it occurs.

components/storage_monitor/storage_monitor_win.h

Index: components/storage_monitor/storage_monitor_win.h
diff --git a/components/storage_monitor/storage_monitor_win.h b/components/storage_monitor/storage_monitor_win.h
index f59b3c3a9f16478fb2e7218816e2a3a339250fcc..d63cef5f7060ccaa23cf6469fbb4c5f6cf86f7a8 100644
--- a/components/storage_monitor/storage_monitor_win.h
+++ b/components/storage_monitor/storage_monitor_win.h
@@ -50,6 +50,8 @@ class StorageMonitorWin : public StorageMonitor {
   class PortableDeviceNotifications;
   friend class TestStorageMonitorWin;
 
+  void MediaChangeNotificationRegister();
+
   // Gets the removable storage information given a |device_path|. On success,
   // returns true and fills in |info|.
   bool GetDeviceInfo(const base::FilePath& device_path,
@@ -62,6 +64,7 @@ class StorageMonitorWin : public StorageMonitor {
                            LPARAM lparam);
 
   void OnDeviceChange(UINT event_type, LPARAM data);
+  void OnMediaChange(WPARAM wparam, LPARAM lparam);
 
   // The window class of |window_|.
   ATOM window_class_;
@@ -70,6 +73,9 @@ class StorageMonitorWin : public StorageMonitor {
   HMODULE instance_;
   HWND window_;
 
+  // The handle of a registration for shell notifications.
+  ULONG registration_handle_;

[vandebo (ex-Chrome), 2014/04/23 16:34:35]

This could have a more descriptive name

[Kevin Bailey, 2014/04/23 18:06:14]

|notification_registration_handle_| ? I use "handle" because different versions
of the SDK call it different things, one of which is a handle.

Would it help to say more in the comment ?
"This is returned by ...Register and must be passed to ...Deregister."

[vandebo (ex-Chrome), 2014/04/23 18:09:27]

There's lots of things that are registered... shell_change_notify_handle_ ?

[rvargas (doing something else), 2014/04/23 18:45:15]

Given that this is not really a handle, shell_change_notify_id_ seems better.

[Kevin Bailey, 2014/04/24 15:12:38]

Done.

+
   // The volume mount point watcher, used to manage the mounted devices.
   scoped_ptr<VolumeMountWatcherWin> volume_mount_watcher_;