IPC pickling optimization for render passes.

content/common/cc_messages.h

Index: content/common/cc_messages.h
diff --git a/content/common/cc_messages.h b/content/common/cc_messages.h
index b1271b30b61e8e9418d05905e12aec31dc2cb2f4..f5bb6f16e145b71616590a4309b9d5c9ff1f9730 100644
--- a/content/common/cc_messages.h
+++ b/content/common/cc_messages.h
@@ -77,6 +77,7 @@ template <>
 struct CONTENT_EXPORT ParamTraits<cc::RenderPass> {
   typedef cc::RenderPass param_type;
   static void Write(Message* m, const param_type& p);
+  static size_t ReserveSizeForWrite(const param_type& p);

[Tom Sepez, 2013/10/24 17:48:06]

I'm not sure making this a method of this particular specialization of the
templated paramtraits class is the right thing to do since none of the other
specializations will implement this. It doesn't need to be called oustide of the
write() method, so I'd suggest using a static  function or a function in an
anonymous namespace in the .cc file.

[danakj, 2013/10/24 17:51:38]

Alright. I wanted to keep it close to the Write() method so that people would
more obviously see to update both together..

   static bool Read(const Message* m, PickleIterator* iter, param_type* r);
   static void Log(const param_type& p, std::string* l);
 };