Convert offscreen canvas to use FrameSinkManagerHost.

ui/compositor/test/in_process_context_factory.h

 // Copyright 2014 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_TEST_IN_PROCESS_CONTEXT_FACTORY_H_
 #define UI_COMPOSITOR_TEST_IN_PROCESS_CONTEXT_FACTORY_H_
 
 #include <stdint.h>
 #include <memory>
 
@@ skipping 42 matching lines @@
 
   scoped_refptr<cc::ContextProvider> SharedMainThreadContextProvider() override;
   void RemoveCompositor(Compositor* compositor) override;
   bool DoesCreateTestContexts() override;
   uint32_t GetImageTextureTarget(gfx::BufferFormat format,
                                  gfx::BufferUsage usage) override;
   gpu::GpuMemoryBufferManager* GetGpuMemoryBufferManager() override;
   cc::TaskGraphRunner* GetTaskGraphRunner() override;
   cc::FrameSinkId AllocateFrameSinkId() override;
   cc::SurfaceManager* GetSurfaceManager() override;
+  cc::mojom::DisplayCompositor* GetDisplayCompositor() override;
   void SetDisplayVisible(ui::Compositor* compositor, bool visible) override;
   void ResizeDisplay(ui::Compositor* compositor,
                      const gfx::Size& size) override;
   void SetDisplayColorSpace(
       ui::Compositor* compositor,
       const gfx::ColorSpace& blending_color_space,
       const gfx::ColorSpace& output_color_space) override {}
   void SetAuthoritativeVSyncInterval(ui::Compositor* compositor,
                                      base::TimeDelta interval) override {}
   void SetDisplayVSyncParameters(ui::Compositor* compositor,
@@ skipping 23 matching lines @@
   using PerCompositorDataMap =
       base::hash_map<ui::Compositor*, std::unique_ptr<PerCompositorData>>;
   PerCompositorDataMap per_compositor_data_;
 
   DISALLOW_COPY_AND_ASSIGN(InProcessContextFactory);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_TEST_IN_PROCESS_CONTEXT_FACTORY_H_