Mus: Implement GpuMain mojo interface

services/ui/surfaces/display_compositor_factory_delegate.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 SERVICES_UI_SURFACES_DISPLAY_COMPOSITOR_FACTORY_DELEGATE_H_
+#define SERVICES_UI_SURFACES_DISPLAY_COMPOSITOR_FACTORY_DELEGATE_H_
+
+namespace gpu {
+class GpuMemoryBufferManager;
+}
+
+namespace ui {
+
+class DisplayCompositorFactoryDelegate {
+ public:
+  virtual std::unique_ptr<gpu::GpuMemoryBufferManager>
+  CreateGpuMemoryBufferManager() = 0;
+
+ protected:
+  ~DisplayCompositorFactoryDelegate() {}
+};
+
+}  // namespace ui
+
+#endif  // SERVICES_UI_SURFACES_DISPLAY_COMPOSITOR_FACTORY_DELEGATE_H_