Add/remove surface references via MojoCompositorFrameSink.

content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.h

Index: content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.h
diff --git a/content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.h b/content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.h
index 27d0dc5051fd6a9b3b04cc1bf19fb2db03b6d33e..34b80bf9355d22b1d2bb47eefa2aa73d72ca068c 100644
--- a/content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.h
+++ b/content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.h
@@ -5,6 +5,9 @@
 #ifndef CONTENT_BROWSER_RENDERER_HOST_OFFSCREEN_CANVAS_COMPOSITOR_FRAME_SINK_H_
 #define CONTENT_BROWSER_RENDERER_HOST_OFFSCREEN_CANVAS_COMPOSITOR_FRAME_SINK_H_
 
+#include <memory>
+#include <vector>
+
 #include "cc/surfaces/surface_factory.h"
 #include "cc/surfaces/surface_factory_client.h"
 #include "third_party/WebKit/public/platform/modules/offscreencanvas/offscreen_canvas_surface.mojom.h"
@@ -28,6 +31,10 @@ class OffscreenCanvasCompositorFrameSink
   void SubmitCompositorFrame(const cc::LocalFrameId& local_frame_id,
                              cc::CompositorFrame frame) override;
   void SetNeedsBeginFrame(bool needs_begin_frame) override;
+  void AddSurfaceReferences(
+      const std::vector<cc::SurfaceReference>& references) override;
+  void RemoveSurfaceReferences(
+      const std::vector<cc::SurfaceReference>& references) override;
   void EvictFrame() override;
 
   // cc::SurfaceFactoryClient implementation.