Add a receiver interface to RemovableStorageNotifications.

chrome/browser/system_monitor/media_transfer_protocol_device_observer_linux.h

Index: chrome/browser/system_monitor/media_transfer_protocol_device_observer_linux.h
diff --git a/chrome/browser/system_monitor/media_transfer_protocol_device_observer_linux.h b/chrome/browser/system_monitor/media_transfer_protocol_device_observer_linux.h
index 45c9e67ae66c832abbf0e5f0ce17487706745d96..68aa4ed11b72ce805319f0d9d7710a5ca1c7f25f 100644
--- a/chrome/browser/system_monitor/media_transfer_protocol_device_observer_linux.h
+++ b/chrome/browser/system_monitor/media_transfer_protocol_device_observer_linux.h
@@ -42,6 +42,10 @@ class MediaTransferProtocolDeviceObserverLinux
       const base::FilePath& path,
       RemovableStorageNotifications::StorageInfo* storage_info) const;
 
+  // Set the volume notifications object to be used when new
+  // MTP devices are found.
+  void SetNotifications(RemovableStorageNotifications::Receiver* notifications);
+
  protected:
   // Only used in unit tests.
   explicit MediaTransferProtocolDeviceObserverLinux(
@@ -67,6 +71,12 @@ class MediaTransferProtocolDeviceObserverLinux
   // handler for unit testing.
   GetStorageInfoFunc get_storage_info_func_;
 
+  // The notifications object to use to signal newly attached devices.
+  // Guaranteed to outlive this class.
+  // TODO(gbillock): Edit this when this class is owned by a
+  // RemovableStorageNotifications subclass.
+  RemovableStorageNotifications::Receiver* notifications_;
+
   DISALLOW_COPY_AND_ASSIGN(MediaTransferProtocolDeviceObserverLinux);
 };