Clean up RenderWidgetHostView(ChildFrame and Guest) compositing code

cc/surfaces/surface_info.h

Index: cc/surfaces/surface_info.h
diff --git a/cc/surfaces/surface_info.h b/cc/surfaces/surface_info.h
index cbe7a0a09dc6fb654dab153dea325876c64e6ece..1c77d98976fc0ab291d449a462f4322bad8330ae 100644
--- a/cc/surfaces/surface_info.h
+++ b/cc/surfaces/surface_info.h
@@ -8,6 +8,11 @@
 #include "cc/surfaces/surface_id.h"
 #include "ui/gfx/geometry/size.h"
 
+namespace IPC {
+template <class T>
+struct ParamTraits;
+}  // namespace IPC
+
 namespace cc {
 namespace mojom {
 class SurfaceInfoDataView;
@@ -38,6 +43,7 @@ class SurfaceInfo {
 
  private:
   friend struct mojo::StructTraits<mojom::SurfaceInfoDataView, SurfaceInfo>;
+  friend struct IPC::ParamTraits<SurfaceInfo>;
 
   SurfaceId id_;
   float device_scale_factor_ = 1.f;