Implement IPC::ParamTraits<mojo::MessagePipeHandle>

ipc/mojo/ipc_mojo_param_traits.cc

Index: ipc/mojo/ipc_mojo_param_traits.cc
diff --git a/ipc/mojo/ipc_mojo_param_traits.cc b/ipc/mojo/ipc_mojo_param_traits.cc
new file mode 100644
index 0000000000000000000000000000000000000000..80c3ca70c92c6a92965956d5ec61bb082977932a
--- /dev/null
+++ b/ipc/mojo/ipc_mojo_param_traits.cc
@@ -0,0 +1,43 @@
+// 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/mojo/ipc_mojo_param_traits.h"
+
+#include "ipc/ipc_message_utils.h"
+#include "ipc/mojo/ipc_mojo_message_helper.h"
+
+namespace IPC {
+
+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,
+                                                PickleIterator* iter,
+                                                param_type* r) {
+  bool is_valid;
+  if (!ReadParam(m, iter, &is_valid))
+    return false;
+  if (!is_valid)
+    return true;
+
+  mojo::ScopedMessagePipeHandle handle;
+  if (!MojoMessageHelper::ReadMessagePipeFrom(m, iter, &handle))
+    return false;
+  DCHECK(handle.is_valid());
+  *r = handle.release();
+  return true;
+}
+
+void ParamTraits<mojo::MessagePipeHandle>::Log(const param_type& p,
+                                               std::string* l) {
+  l->append("mojo::MessagePipeHandle(");
+  LogParam(p.value(), l);
+  l->append(")");
+}
+
+}  // namespace IPC