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

chrome/common/cast_messages.h

Index: chrome/common/cast_messages.h
diff --git a/chrome/common/cast_messages.h b/chrome/common/cast_messages.h
index 83f9981739dffc046694274b1ce9526f9547f575..68eecd61e64388e63faa16df4bd6a3e772eea7f0 100644
--- a/chrome/common/cast_messages.h
+++ b/chrome/common/cast_messages.h
@@ -21,6 +21,7 @@ namespace IPC {
 template<>
 struct ParamTraits<media::cast::RtpTimeTicks> {
   using param_type = media::cast::RtpTimeTicks;
+  static void GetSize(base::PickleSizer* s, const param_type& p);
   static void Write(base::Pickle* m, const param_type& p);
   static bool Read(const base::Pickle* m,
                    base::PickleIterator* iter,
@@ -31,6 +32,7 @@ struct ParamTraits<media::cast::RtpTimeTicks> {
 template<>
 struct ParamTraits<media::cast::FrameId> {
   using param_type = media::cast::FrameId;
+  static void GetSize(base::PickleSizer* s, const param_type& p);
   static void Write(base::Pickle* m, const param_type& p);
   static bool Read(const base::Pickle* m,
                    base::PickleIterator* iter,