Mus: Implement GpuMain mojo interface

services/ui/gpu/gpu_main.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_GPU_GPU_MAIN_H_
 #define SERVICES_UI_GPU_GPU_MAIN_H_
 
 #include "base/threading/thread.h"
+#include "gpu/ipc/in_process_command_buffer.h"
 #include "gpu/ipc/service/gpu_init.h"
+#include "services/ui/gpu/interfaces/gpu_main.mojom.h"
 #include "services/ui/gpu/interfaces/gpu_service_internal.mojom.h"
+#include "services/ui/surfaces/display_compositor.h"
 
 namespace gpu {
 class GpuMemoryBufferFactory;
+class ImageFactory;
 }
 
 namespace ui {
 
 class GpuServiceInternal;
 
-class GpuMain : public gpu::GpuSandboxHelper {
+class GpuMain : public gpu::GpuSandboxHelper, public mojom::GpuMain {
  public:
-  GpuMain();
+  explicit GpuMain(mojom::GpuMainRequest request);
   ~GpuMain() override;
 
+  // mojom::GpuMain implementation:
+  void CreateGpuService(mojom::GpuServiceInternalRequest request,
+                        const CreateGpuServiceCallback& callback) override;
+  void CreateDisplayCompositor(
+      cc::mojom::DisplayCompositorRequest request,
+      cc::mojom::DisplayCompositorClientPtr client) override;
+
   void OnStart();
-  void Create(mojom::GpuServiceInternalRequest request);
 
   GpuServiceInternal* gpu_service() { return gpu_service_internal_.get(); }
 
  private:
   void InitOnGpuThread(
       scoped_refptr<base::SingleThreadTaskRunner> io_runner,
       scoped_refptr<base::SingleThreadTaskRunner> compositor_runner);
 
+  void CreateDisplayCompositorInternal(
+      cc::mojom::DisplayCompositorRequest request,
+      cc::mojom::DisplayCompositorClientPtrInfo client_info);
+  void CreateDisplayCompositorOnCompositorThread(
+      gpu::ImageFactory* image_factory,
+      mojom::GpuServiceInternalPtrInfo gpu_service_info,
+      cc::mojom::DisplayCompositorRequest request,
+      cc::mojom::DisplayCompositorClientPtrInfo client_info);
+  void CreateGpuServiceOnGpuThread(
+      mojom::GpuServiceInternalRequest request,
+      scoped_refptr<base::SingleThreadTaskRunner> origin_runner,
+      const CreateGpuServiceCallback& callback);
+
   void TearDownOnCompositorThread();
   void TearDownOnGpuThread();
-  void CreateOnGpuThread(mojom::GpuServiceInternalRequest request);
 
   // gpu::GpuSandboxHelper:
   void PreSandboxStartup() override;
   bool EnsureSandboxInitialized(
       gpu::GpuWatchdogThread* watchdog_thread) override;
 
   std::unique_ptr<gpu::GpuInit> gpu_init_;
   std::unique_ptr<GpuServiceInternal> gpu_service_internal_;
+
+  // The message-pipe used by the DisplayCompositor to request gpu memory
+  // buffers.
+  mojom::GpuServiceInternalPtr gpu_internal_;
+
+  // The InCommandCommandBuffer::Service used by the display compositor.
+  scoped_refptr<gpu::InProcessCommandBuffer::Service> gpu_command_service_;
+
+  // If the gpu service is not yet ready then we stash pending MessagePipes in
+  // these member variables.
+  cc::mojom::DisplayCompositorRequest pending_display_compositor_request_;
+  cc::mojom::DisplayCompositorClientPtrInfo
+      pending_display_compositor_client_info_;
+
+  std::unique_ptr<DisplayCompositor> display_compositor_;
+
   std::unique_ptr<gpu::GpuMemoryBufferFactory> gpu_memory_buffer_factory_;
 
   // The main thread for GpuService.
   base::Thread gpu_thread_;
 
   // The thread that handles IO events for GpuService.
   base::Thread io_thread_;
 
-  // The thread used for the display compositor.
+  // The display compositor gets its own thread in mus-gpu. The gpu service,
+  // where GL commands are processed resides on its own thread. Various
+  // components of the display compositor such as Display, ResourceProvider,
+  // and GLRenderer block on sync tokens from other command buffers. Thus,
+  // the gpu service must live on a separate thread.
   base::Thread compositor_thread_;
 
-  base::WeakPtrFactory<GpuMain> weak_factory_;
+  mojo::Binding<mojom::GpuMain> binding_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuMain);
 };
 
 }  // namespace ui
 
 #endif  // SERVICES_UI_GPU_GPU_MAIN_H_