Add LoadComponent API in ImageLoader dbus adapter.

chromeos/dbus/image_loader_client.h

 // Copyright 2016 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 CHROMEOS_DBUS_IMAGE_LOADER_CLIENT_H_
 #define CHROMEOS_DBUS_IMAGE_LOADER_CLIENT_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 10 matching lines @@
  public:
   ~ImageLoaderClient() override;
 
   // Registers a component by copying from |component_folder_abs_path| into its
   // internal storage, if and only if, the component passes verification.
   virtual void RegisterComponent(const std::string& name,
                                  const std::string& version,
                                  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();
 
  protected:
   // Create() should be used instead.
   ImageLoaderClient();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ImageLoaderClient);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_IMAGE_LOADER_CLIENT_H_