Explicitly serialise platform file attachments instead of doing them implicitly as a mojo handle at…

ipc/mojo/ipc_channel_mojo_unittest.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 "ipc/mojo/ipc_channel_mojo.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <memory>
 #include <utility>
@@ skipping 344 matching lines @@
     WriteFile(message, file);
     WritePipe(message, pipe);
     ASSERT_TRUE(sender->Send(message));
   }
 
   static void ReadReceivedFile(const IPC::Message& message,
                                base::PickleIterator* iter) {
     base::ScopedFD fd;
     scoped_refptr<base::Pickle::Attachment> attachment;
     EXPECT_TRUE(message.ReadAttachment(iter, &attachment));
+    EXPECT_EQ(IPC::MessageAttachment::TYPE_PLATFORM_FILE,
+              static_cast<IPC::MessageAttachment*>(attachment.get())
+                  ->GetType());
     base::File file(static_cast<IPC::MessageAttachment*>(attachment.get())
                         ->TakePlatformFile());
     std::string content(GetSendingFileContent().size(), ' ');
     file.Read(0, &content[0], content.size());
     EXPECT_EQ(content, GetSendingFileContent());
   }
 #endif
 };
 
 class ListenerThatExpectsMessagePipe : public IPC::Listener {
@@ skipping 352 matching lines @@
   Connect(&listener);
 
   base::MessageLoop::current()->Run();
 
   Close();
 }
 
 #endif  // OS_LINUX
 
 }  // namespace