Generate param traits size methods for IPC files in chrome/ (and traits it depends on).

components/nacl/common/nacl_renderer_messages.cc

Index: components/nacl/common/nacl_renderer_messages.cc
diff --git a/components/nacl/common/nacl_renderer_messages.cc b/components/nacl/common/nacl_renderer_messages.cc
index 09509016410cd83f0ef370adfeb0424e532c578d..a703c1eb003d90ae02fa2ca52989ebd1f10e709e 100644
--- a/components/nacl/common/nacl_renderer_messages.cc
+++ b/components/nacl/common/nacl_renderer_messages.cc
@@ -14,6 +14,12 @@
 #include "ipc/struct_destructor_macros.h"
 #include "components/nacl/common/nacl_renderer_messages.h"
 
+// Generate param traits size methods.
+#include "ipc/param_traits_size_macros.h"
+namespace IPC {
+#include "components/nacl/common/nacl_renderer_messages.h"
+}
+
 // Generate param traits write methods.
 #include "ipc/param_traits_write_macros.h"
 namespace IPC {