mus: Split the gpu client-lib into a separate component.

ui/aura/mus/mus_context_factory.h

 // Copyright 2015 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 UI_AURA_MUS_MUS_CONTEXT_FACTORY_H_
 #define UI_AURA_MUS_MUS_CONTEXT_FACTORY_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
 #include "cc/surfaces/surface_manager.h"
 #include "services/ui/public/cpp/raster_thread_helper.h"
 #include "services/ui/public/interfaces/window_tree.mojom.h"
 #include "ui/aura/aura_export.h"
 #include "ui/compositor/compositor.h"
 
+namespace ui {
+class GpuService;
+}
+
 namespace aura {
-class GpuService;
 
 // ContextFactory implementation that can be used with Mus.
 class AURA_EXPORT MusContextFactory : public ui::ContextFactory {
  public:
-  explicit MusContextFactory(GpuService* gpu_service);
+  explicit MusContextFactory(ui::GpuService* gpu_service);
   ~MusContextFactory() override;
 
  private:
   // ContextFactory:
   void CreateCompositorFrameSink(
       base::WeakPtr<ui::Compositor> compositor) override;
   std::unique_ptr<ui::Reflector> CreateReflector(
       ui::Compositor* mirrored_compositor,
       ui::Layer* mirroring_layer) override;
   void RemoveReflector(ui::Reflector* reflector) override;
@@ skipping 16 matching lines @@
   void SetDisplayVSyncParameters(ui::Compositor* compositor,
                                  base::TimeTicks timebase,
                                  base::TimeDelta interval) override {}
   void SetOutputIsSecure(ui::Compositor* compositor, bool secure) override {}
   void AddObserver(ui::ContextFactoryObserver* observer) override {}
   void RemoveObserver(ui::ContextFactoryObserver* observer) override {}
 
   cc::SurfaceManager surface_manager_;
   uint32_t next_sink_id_;
   ui::RasterThreadHelper raster_thread_helper_;
-  GpuService* gpu_service_;
+  ui::GpuService* gpu_service_;
 
   DISALLOW_COPY_AND_ASSIGN(MusContextFactory);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_MUS_MUS_CONTEXT_FACTORY_H_