Add LoadComponent API in ImageLoader dbus adapter.

chromeos/dbus/image_loader_client.h

Index: chromeos/dbus/image_loader_client.h
diff --git a/chromeos/dbus/image_loader_client.h b/chromeos/dbus/image_loader_client.h
index f5dcd5843600f1353d94da94cd2fca31644b3431..d7d889a443e994bc4007008d0dce319d8d5242c2 100644
--- a/chromeos/dbus/image_loader_client.h
+++ b/chromeos/dbus/image_loader_client.h
@@ -28,6 +28,11 @@ class CHROMEOS_EXPORT ImageLoaderClient : public DBusClient {
                                  const std::string& component_folder_abs_path,
                                  const BoolDBusMethodCallback& callback) = 0;
 
+  // Mount a component given the |name| and return the mount point (if call is
+  // successful).
+  virtual void LoadComponent(const std::string& name,
+                             const StringDBusMethodCallback& callback) = 0;
+
   // Factory function, creates a new instance and returns ownership.
   // For normal usage, access the singleton via DBusThreadManager::Get().
   static ImageLoaderClient* Create();