Convert offscreen canvas to use FrameSinkManagerHost.

content/browser/renderer_host/offscreen_canvas_surface_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 CONTENT_BROWSER_RENDERER_HOST_OFFSCREEN_CANVAS_SURFACE_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_OFFSCREEN_CANVAS_SURFACE_IMPL_H_
 
 #include "cc/ipc/frame_sink_manager.mojom.h"
 #include "cc/surfaces/surface_id.h"
-#include "mojo/public/cpp/bindings/interface_request.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 #include "third_party/WebKit/public/platform/modules/offscreencanvas/offscreen_canvas_surface.mojom.h"
 
 namespace content {
 
+// The browser owned object for an offscreen canvas connection. Holds
+// connections to both the renderer and frame sink manager.
 class CONTENT_EXPORT OffscreenCanvasSurfaceImpl
     : public blink::mojom::OffscreenCanvasSurface {
  public:
   OffscreenCanvasSurfaceImpl(const cc::FrameSinkId& parent_frame_sink_id,
                              const cc::FrameSinkId& frame_sink_id,
                              cc::mojom::FrameSinkManagerClientPtr client);
   ~OffscreenCanvasSurfaceImpl() override;
 
   static void Create(const cc::FrameSinkId& parent_frame_sink_id,
                      const cc::FrameSinkId& frame_sink_id,
                      cc::mojom::FrameSinkManagerClientPtr client,
                      blink::mojom::OffscreenCanvasSurfaceRequest request);
 
+  // Creates a MojoCompositorFrameSink connection to FrameSinkManager for an
+  // offscreen canvas client. The corresponding private interface will be owned
+  // here to control CompositorFrameSink lifetime. This should only ever be
+  // called once.
+  void CreateCompositorFrameSink(
+      cc::mojom::MojoCompositorFrameSinkClientPtr client,
+      cc::mojom::MojoCompositorFrameSinkRequest request);
+
   void OnSurfaceCreated(const cc::SurfaceInfo& surface_info);
 
   // blink::mojom::OffscreenCanvasSurface implementation.
   void Require(const cc::SurfaceId& surface_id,
                const cc::SurfaceSequence& sequence) override;
   void Satisfy(const cc::SurfaceSequence& sequence) override;
 
   const cc::FrameSinkId& frame_sink_id() const { return frame_sink_id_; }
 
   const cc::FrameSinkId& parent_frame_sink_id() const {
     return parent_frame_sink_id_;
   }
 
   const cc::LocalSurfaceId& current_local_surface_id() const {
     return current_local_surface_id_;
   }
 
  private:
   cc::mojom::FrameSinkManagerClientPtr client_;
   mojo::StrongBindingPtr<blink::mojom::OffscreenCanvasSurface> binding_;
 
+  // Private connection for the CompositorFrameSink. The CompositorFrameSink
+  // will not be destroyed until both private and offscreen canvas client
+  // connections are closed.
+  cc::mojom::MojoCompositorFrameSinkPrivatePtr compositor_frame_sink_private_;
+
   // Surface-related state
   const cc::FrameSinkId frame_sink_id_;
   cc::LocalSurfaceId current_local_surface_id_;
   const cc::FrameSinkId parent_frame_sink_id_;
 
+  bool has_created_compositor_frame_sink_ = false;
+
   DISALLOW_COPY_AND_ASSIGN(OffscreenCanvasSurfaceImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_OFFSCREEN_CANVAS_SURFACE_IMPL_H_