Convert offscreen canvas to use FrameSinkManagerHost.

ui/compositor/compositor.h

 // Copyright (c) 2012 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_COMPOSITOR_COMPOSITOR_H_
 #define UI_COMPOSITOR_COMPOSITOR_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 30 matching lines @@
 class AnimationHost;
 class AnimationTimeline;
 class ContextProvider;
 class Layer;
 class LayerTreeDebugState;
 class LayerTreeHost;
 class LocalSurfaceId;
 class RendererSettings;
 class SurfaceManager;
 class TaskGraphRunner;
+namespace mojom {
+class DisplayCompositor;
+}
 }
 
 namespace gfx {
 class Rect;
 class ScrollOffset;
 class Size;
 }
 
 namespace gpu {
 class GpuMemoryBufferManager;
@@ skipping 35 matching lines @@
 
   // Removes the reflector, which stops the mirroring.
   virtual void RemoveReflector(Reflector* reflector) = 0;
 
   // Allocate a new client ID for the display compositor.
   virtual cc::FrameSinkId AllocateFrameSinkId() = 0;
 
   // Gets the surface manager.
   virtual cc::SurfaceManager* GetSurfaceManager() = 0;
 
+  // Gets a Mojo pointer to the DisplayCompositor.
+  virtual cc::mojom::DisplayCompositor* GetDisplayCompositor() = 0;
+
   // Inform the display corresponding to this compositor if it is visible. When
   // false it does not need to produce any frames. Visibility is reset for each
   // call to CreateCompositorFrameSink.
   virtual void SetDisplayVisible(ui::Compositor* compositor, bool visible) = 0;
 
   // Resize the display corresponding to this compositor to a particular size.
   virtual void ResizeDisplay(ui::Compositor* compositor,
                              const gfx::Size& size) = 0;
 
   // Set the output color profile into which this compositor should render.
@@ skipping 302 matching lines @@
 
   base::WeakPtrFactory<Compositor> weak_ptr_factory_;
   base::WeakPtrFactory<Compositor> lock_timeout_weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Compositor);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_COMPOSITOR_H_