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

content/common/indexed_db/indexed_db_param_traits.h

Index: content/common/indexed_db/indexed_db_param_traits.h
diff --git a/content/common/indexed_db/indexed_db_param_traits.h b/content/common/indexed_db/indexed_db_param_traits.h
index e11b2830743e368363ccd6b5e8a4c90c66283bc9..1bbb8ac8008197df3bf0514ee68a87c416c9702b 100644
--- a/content/common/indexed_db/indexed_db_param_traits.h
+++ b/content/common/indexed_db/indexed_db_param_traits.h
@@ -21,6 +21,7 @@ namespace IPC {
 template <>
 struct ParamTraits<content::IndexedDBKey> {
   typedef content::IndexedDBKey param_type;
+  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<content::IndexedDBKey> {
 template <>
 struct ParamTraits<content::IndexedDBKeyRange> {
   typedef content::IndexedDBKeyRange param_type;
+  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,
@@ -41,6 +43,7 @@ struct ParamTraits<content::IndexedDBKeyRange> {
 template <>
 struct ParamTraits<content::IndexedDBKeyPath> {
   typedef content::IndexedDBKeyPath param_type;
+  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,