Create manager to track OffscreenCanvasSurfaceImpl instances

content/browser/renderer_host/offscreen_canvas_surface_impl.h

Index: content/browser/renderer_host/offscreen_canvas_surface_impl.h
diff --git a/content/browser/renderer_host/offscreen_canvas_surface_impl.h b/content/browser/renderer_host/offscreen_canvas_surface_impl.h
index 6ab9214688f598d4f8d5cb1e798b6c2972d50b24..9ccc562018e6f54137581f13e640ac7b61072ed3 100644
--- a/content/browser/renderer_host/offscreen_canvas_surface_impl.h
+++ b/content/browser/renderer_host/offscreen_canvas_surface_impl.h
@@ -5,6 +5,7 @@
 #ifndef CONTENT_BROWSER_RENDERER_HOST_OFFSCREEN_CANVAS_SURFACE_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_OFFSCREEN_CANVAS_SURFACE_IMPL_H_
 
+#include "base/memory/weak_ptr.h"
 #include "cc/surfaces/surface_id.h"
 #include "cc/surfaces/surface_id_allocator.h"
 #include "mojo/public/cpp/bindings/interface_request.h"
@@ -13,7 +14,8 @@
 
 namespace content {
 
-class OffscreenCanvasSurfaceImpl : public blink::mojom::OffscreenCanvasSurface {
+class CONTENT_EXPORT OffscreenCanvasSurfaceImpl
+    : public blink::mojom::OffscreenCanvasSurface {
  public:
   OffscreenCanvasSurfaceImpl();
   ~OffscreenCanvasSurfaceImpl() override;
@@ -26,10 +28,17 @@ class OffscreenCanvasSurfaceImpl : public blink::mojom::OffscreenCanvasSurface {
                const cc::SurfaceSequence& sequence) override;
   void Satisfy(const cc::SurfaceSequence& sequence) override;
 
+  const cc::FrameSinkId& frame_sink_id() const { return frame_sink_id_; }
+  base::WeakPtr<OffscreenCanvasSurfaceImpl> GetWeakPtr() {
+    return weak_factory_.GetWeakPtr();
+  }
+
  private:
   // Surface-related state
   std::unique_ptr<cc::SurfaceIdAllocator> id_allocator_;
-  cc::SurfaceId surface_id_;
+  cc::FrameSinkId frame_sink_id_;
+
+  base::WeakPtrFactory<OffscreenCanvasSurfaceImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(OffscreenCanvasSurfaceImpl);
 };