Decouple GpuCompositorFrameSink from DisplayCompositor

services/ui/surfaces/display_compositor.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 SERVICES_UI_SURFACES_DISPLAY_COMPOSITOR_H_
 #define SERVICES_UI_SURFACES_DISPLAY_COMPOSITOR_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <unordered_map>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/threading/thread_checker.h"
 #include "cc/ipc/display_compositor.mojom.h"
 #include "cc/surfaces/frame_sink_id.h"
 #include "cc/surfaces/local_frame_id.h"
 #include "cc/surfaces/surface_id.h"
 #include "cc/surfaces/surface_manager.h"
 #include "cc/surfaces/surface_observer.h"
+#include "components/display_compositor/gpu_compositor_frame_sink_delegate.h"
 #include "gpu/command_buffer/client/gpu_memory_buffer_manager.h"
 #include "gpu/ipc/common/surface_handle.h"
 #include "gpu/ipc/in_process_command_buffer.h"
 #include "ipc/ipc_channel_handle.h"
 #include "mojo/public/cpp/bindings/binding.h"
 
 namespace gpu {
 class GpuMemoryBufferManager;
 class ImageFactory;
 }
 
 namespace cc {
 class Display;
 class SurfaceManager;
 class SyntheticBeginFrameSource;
 }
 
+namespace display_compositor {
+class GpuCompositorFrameSink;
+}
+
 namespace ui {
 
-class GpuCompositorFrameSink;
-
 // The DisplayCompositor object is an object global to the Window Server app
 // that holds the SurfaceServer and allocates new Surfaces namespaces.
 // This object lives on the main thread of the Window Server.
 // TODO(rjkroege, fsamuel): This object will need to change to support multiple
 // displays.
-class DisplayCompositor : public cc::SurfaceObserver,
-                          public cc::mojom::DisplayCompositor {
+class DisplayCompositor
+    : public cc::SurfaceObserver,
+      public display_compositor::GpuCompositorFrameSinkDelegate,
+      public cc::mojom::DisplayCompositor {
  public:
   DisplayCompositor(
       scoped_refptr<gpu::InProcessCommandBuffer::Service> gpu_service,
       std::unique_ptr<gpu::GpuMemoryBufferManager> gpu_memory_buffer_manager,
       gpu::ImageFactory* image_factory,
       cc::mojom::DisplayCompositorRequest request,
       cc::mojom::DisplayCompositorClientPtr client);
   ~DisplayCompositor() override;
 
   cc::SurfaceManager* manager() { return &manager_; }
 
-  // Adds surface references. For each reference added, this will remove the
-  // temporary reference to the child surface if one exists.
-  void AddSurfaceReferences(
-      const std::vector<cc::SurfaceReference>& references);
-
-  // Removes surface references.
-  void RemoveSurfaceReferences(
-      const std::vector<cc::SurfaceReference>& references);
-
-  // We must avoid destroying a GpuCompositorFrameSink until both the display
-  // compositor host and the client drop their connection to avoid getting into
-  // a state where surfaces references are inconsistent.
-  void OnCompositorFrameSinkClientConnectionLost(
-      const cc::FrameSinkId& frame_sink_id,
-      bool destroy_compositor_frame_sink);
-  void OnCompositorFrameSinkPrivateConnectionLost(
-      const cc::FrameSinkId& frame_sink_id,
-      bool destroy_compositor_frame_sink);
+  // display_compositor::GpuCompositorFrameSinkDelegate implementation.
+  void OnClientConnectionLost(const cc::FrameSinkId& frame_sink_id,
+                              bool destroy_compositor_frame_sink) override;
+  void OnPrivateConnectionLost(const cc::FrameSinkId& frame_sink_id,
+                               bool destroy_compositor_frame_sink) override;
 
   // cc::mojom::DisplayCompositor implementation:
   void CreateDisplayCompositorFrameSink(
       const cc::FrameSinkId& frame_sink_id,
       gpu::SurfaceHandle surface_handle,
       cc::mojom::MojoCompositorFrameSinkAssociatedRequest request,
       cc::mojom::MojoCompositorFrameSinkPrivateRequest private_request,
       cc::mojom::MojoCompositorFrameSinkClientPtr client,
       cc::mojom::DisplayPrivateAssociatedRequest display_private_request)
       override;
@@ skipping 32 matching lines @@
   cc::SurfaceManager manager_;
 
   // Will normally point to |manager_| as it provides the interface. For tests
   // it will be swapped out with a mock implementation.
   cc::SurfaceReferenceManager* reference_manager_;
 
   scoped_refptr<gpu::InProcessCommandBuffer::Service> gpu_service_;
   std::unique_ptr<gpu::GpuMemoryBufferManager> gpu_memory_buffer_manager_;
   gpu::ImageFactory* image_factory_;
 
-  std::unordered_map<cc::FrameSinkId,
-                     std::unique_ptr<GpuCompositorFrameSink>,
-                     cc::FrameSinkIdHash>
+  std::unordered_map<
+      cc::FrameSinkId,
+      std::unique_ptr<display_compositor::GpuCompositorFrameSink>,
+      cc::FrameSinkIdHash>
       compositor_frame_sinks_;
 
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
 
   base::ThreadChecker thread_checker_;
 
   cc::mojom::DisplayCompositorClientPtr client_;
   mojo::Binding<cc::mojom::DisplayCompositor> binding_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayCompositor);
 };
 
 }  // namespace ui
 
 #endif  //  SERVICES_UI_SURFACES_DISPLAY_COMPOSITOR_H_