List all child surfaces (including occluded) in CompositorFrame

cc/quads/render_pass.h

Index: cc/quads/render_pass.h
diff --git a/cc/quads/render_pass.h b/cc/quads/render_pass.h
index 14caeba7c7af9d0fceadac7435b9795c3d5a9000..5966e8d7fc89e943a791c278f9dc78ae02f71300 100644
--- a/cc/quads/render_pass.h
+++ b/cc/quads/render_pass.h
@@ -117,10 +117,6 @@ class CC_EXPORT RenderPass {
   QuadList quad_list;
   SharedQuadStateList shared_quad_state_list;
 
-  // This vector contains the complete set of SurfaceIds referenced by
-  // DrawQuads in quad_list.
-  std::vector<SurfaceId> referenced_surfaces;
-
  protected:
   explicit RenderPass(size_t num_layers);
   RenderPass();