Add helper function to generate a pair of ChannelHandles for ChannelMojo.

ipc/ipc_channel_common.cc

 // Copyright 2014 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 "build/build_config.h"
 #include "ipc/ipc_channel.h"
 #include "ipc/ipc_channel_mojo.h"
+#include "mojo/public/cpp/system/message_pipe.h"
 
 namespace IPC {
 
 // static
 std::unique_ptr<Channel> Channel::CreateClient(
     const IPC::ChannelHandle& channel_handle,
     Listener* listener) {
   if (channel_handle.mojo_handle.is_valid()) {
     return ChannelMojo::Create(
         mojo::ScopedMessagePipeHandle(channel_handle.mojo_handle),
@@ skipping 31 matching lines @@
     const IPC::ChannelHandle& channel_handle,
     Listener* listener) {
   if (channel_handle.mojo_handle.is_valid()) {
     return ChannelMojo::Create(
         mojo::ScopedMessagePipeHandle(channel_handle.mojo_handle),
         Channel::MODE_SERVER, listener);
   }
   return Channel::Create(channel_handle, Channel::MODE_SERVER, listener);
 }
 
+// static
+void Channel::GenerateMojoChannelHandlePair(
+    const std::string& name_postfix,
+    IPC::ChannelHandle* handle0,
+    IPC::ChannelHandle* handle1) {
+  DCHECK_NE(handle0, handle1);
+  // |name| is only used for logging and to aid developers in debugging. It
+  // doesn't _need_ to be unique, but this string is probably more useful than a
+  // generic "ChannelMojo".
+#if !defined(OS_NACL_SFI)
+  std::string name = "ChannelMojo-" + GenerateUniqueRandomChannelID();
+#else
+  std::string name = "ChannelMojo";
+#endif
+  if (!name_postfix.empty()) {
+    name += "-" + name_postfix;
+  }
+  mojo::MessagePipe message_pipe;
+  *handle0 = ChannelHandle(name);
+  handle0->mojo_handle = message_pipe.handle0.release();
+  *handle1 = ChannelHandle(name);
+  handle1->mojo_handle = message_pipe.handle1.release();
+}
+
 Channel::~Channel() {
 }
 
 bool Channel::IsSendThreadSafe() const {
   return false;
 }
 
 void Channel::OnSetAttachmentBrokerEndpoint() {
   CHECK(!did_start_connect_);
 }
 
 void Channel::WillConnect() {
   did_start_connect_ = true;
 }
 
 }  // namespace IPC