Introduce DisplayCompositor Mojo API for Mus

components/mus/surfaces/compositor_frame_sink_factory_impl.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 COMPONENTS_MUS_SURFACES_COMPOSITOR_FRAME_SINK_FACTORY_IMPL_H_
+#define COMPONENTS_MUS_SURFACES_COMPOSITOR_FRAME_SINK_FACTORY_IMPL_H_
+
+#include "cc/surfaces/surface_id_allocator.h"
+#include "components/mus/public/interfaces/display_compositor.mojom.h"
+#include "components/mus/surfaces/compositor_frame_sink_delegate.h"
+#include "components/mus/surfaces/surfaces_state.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+
+namespace mus {
+
+class CompositorFrameSinkImpl;
+
+class CompositorFrameSinkFactoryImpl : public mojom::CompositorFrameSinkFactory,
+                                       public CompositorFrameSinkDelegate {
+ public:
+  CompositorFrameSinkFactoryImpl(
+      int client_id,
+      mojo::InterfaceRequest<mojom::CompositorFrameSinkFactory> request,
+      const scoped_refptr<SurfacesState>& surfaces_state);
+  ~CompositorFrameSinkFactoryImpl() override;
+
+  void CompositorFrameSinkConnectionLost(int sink_id) override;

[rjkroege, 2016/05/19 22:08:38]

// CompositorFrameSinkDelegate implementation?

And, you envisage the need for Delegate how?

[Fady Samuel, 2016/05/25 12:37:01]

For unit testing. One can test this class without having to go out to the
factory.

+  cc::SurfaceId GenerateSurfaceId() override;
+
+  // mojom::CompositorFrameSinkFactory implementation.
+  void CreateCompositorFrameSink(
+      int sink_id,
+      mojo::InterfaceRequest<mojom::CompositorFrameSink> sink,
+      mojom::CompositorFrameSinkClientPtr client) override;
+
+ private:
+  const int client_id_;
+  scoped_refptr<SurfacesState> surfaces_state_;
+  cc::SurfaceIdAllocator allocator_;
+  using CompositorFrameSinkMap =
+      std::map<int, std::unique_ptr<CompositorFrameSinkImpl>>;
+  CompositorFrameSinkMap sinks_;
+  mojo::StrongBinding<mojom::CompositorFrameSinkFactory> binding_;
+
+  DISALLOW_COPY_AND_ASSIGN(CompositorFrameSinkFactoryImpl);
+};
+
+}  // namespace mus
+
+#endif  // COMPONENTS_MUS_SURFACES_COMPOSITOR_FRAME_SINK_FACTORY_IMPL_H_