Support using a Mojo message pipe in a ChannelHandle.

ipc/ipc_mojo_param_traits.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 "ipc/ipc_mojo_param_traits.h"
 
 #include "ipc/ipc_message_utils.h"
 #include "ipc/ipc_mojo_message_helper.h"
 
 namespace IPC {
 
+void ParamTraits<mojo::MessagePipeHandle>::GetSize(base::PickleSizer* sizer,
+                                                   const param_type& p) {
+  sizer->AddBool();

[dcheng, 2016/06/24 07:50:48]

Nit: GetParamSize(sizer, p.is_valid())

[Anand Mistry (off Chromium), 2016/06/27 00:46:24]

Done.

+  if (p.is_valid())
+    sizer->AddAttachment();
+}
+
 void ParamTraits<mojo::MessagePipeHandle>::Write(Message* m,
                                                  const param_type& p) {
   WriteParam(m, p.is_valid());
   if (p.is_valid())
     MojoMessageHelper::WriteMessagePipeTo(m, mojo::ScopedMessagePipeHandle(p));
 }
 
 bool ParamTraits<mojo::MessagePipeHandle>::Read(const Message* m,
                                                 base::PickleIterator* iter,
                                                 param_type* r) {
@@ skipping 12 matching lines @@
 }
 
 void ParamTraits<mojo::MessagePipeHandle>::Log(const param_type& p,
                                                std::string* l) {
   l->append("mojo::MessagePipeHandle(");
   LogParam(p.value(), l);
   l->append(")");
 }
 
 }  // namespace IPC