network service: pass PlzNavigate resulting data via mojo data pipe

ipc/ipc_mojo_param_traits.h

Index: ipc/ipc_mojo_param_traits.h
diff --git a/ipc/ipc_mojo_param_traits.h b/ipc/ipc_mojo_param_traits.h
index 39be43e217a300d337f0cd7d9e9fcb96041ae54f..a4d0228c0a650b5ffbf4511d6efb0e63e44da289 100644
--- a/ipc/ipc_mojo_param_traits.h
+++ b/ipc/ipc_mojo_param_traits.h
@@ -9,6 +9,7 @@
 
 #include "ipc/ipc_export.h"
 #include "ipc/ipc_param_traits.h"
+#include "mojo/public/cpp/system/data_pipe.h"
 #include "mojo/public/cpp/system/message_pipe.h"
 
 namespace base {
@@ -29,6 +30,17 @@ struct IPC_EXPORT ParamTraits<mojo::MessagePipeHandle> {
   static void Log(const param_type& p, std::string* l);
 };
 
+template <>
+struct IPC_EXPORT ParamTraits<mojo::DataPipeConsumerHandle> {
+  typedef mojo::DataPipeConsumerHandle param_type;
+  static void GetSize(base::PickleSizer* sizer, const param_type& p);
+  static void Write(base::Pickle* m, const param_type& p);
+  static bool Read(const base::Pickle* m,
+                   base::PickleIterator* iter,
+                   param_type* r);
+  static void Log(const param_type& p, std::string* l);
+};
+
 }  // namespace IPC
 
 #endif  // IPC_IPC_MOJO_PARAM_TRAITS_H_