Add message sizing to basic IPC traits and struct macros.

mojo/public/cpp/bindings/tests/pickled_struct_chromium.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/public/cpp/bindings/tests/pickled_struct_chromium.h"
 
 #include "base/pickle.h"
 
 namespace mojo {
 namespace test {
 
 PickledStructChromium::PickledStructChromium() {}
 
 PickledStructChromium::PickledStructChromium(int foo, int bar)
     : foo_(foo), bar_(bar) {
 }
 
 PickledStructChromium::~PickledStructChromium() {}
 
 }  // namespace test
 }  // namespace mojo
 
 namespace IPC {
 
+void ParamTraits<mojo::test::PickledStructChromium>::GetSize(
+    base::PickleSizer* sizer,
+    const param_type& p) {
+  sizer->AddInt();
+  sizer->AddInt();
+}
+
 void ParamTraits<mojo::test::PickledStructChromium>::Write(
     base::Pickle* m,
     const param_type& p) {
   m->WriteInt(p.foo());
   m->WriteInt(p.bar());
 }
 
 bool ParamTraits<mojo::test::PickledStructChromium>::Read(
     const base::Pickle* m,
     base::PickleIterator* iter,
     param_type* p) {
   int foo, bar;
   if (!iter->ReadInt(&foo) || !iter->ReadInt(&bar))
     return false;
 
   p->set_foo(foo);
   p->set_bar(bar);
   return true;
 }
 
 }  // namespace IPC