Use IDCompositionSurface to implement DirectCompositionSurfaceWin.

cc/output/output_surface.h

Index: cc/output/output_surface.h
diff --git a/cc/output/output_surface.h b/cc/output/output_surface.h
index e5199e6d6ccf9961114ac2a4c2cc57b88fdf027d..eff0ef4126e2bf3e476a3e0bafe4106c0f484ab4 100644
--- a/cc/output/output_surface.h
+++ b/cc/output/output_surface.h
@@ -79,6 +79,11 @@ class CC_EXPORT OutputSurface {
   // OutputSurfaces.
   virtual void BindFramebuffer() = 0;
 
+  // Marks that the given rectangle will be drawn to on the default, bound
+  // framebuffer. Only valid for surfaces with set_draw_rectangle in the
+  // context capabilities.
+  virtual void SetDrawRectangle(const gfx::Rect& rect) {}
+
   // Get the class capable of informing cc of hardware overlay capability.
   virtual OverlayCandidateValidator* GetOverlayCandidateValidator() const = 0;