Mojo: First stab at making MessagePipes work across OS pipes.

mojo/system/raw_channel_posix_unittest.cc

Index: mojo/system/raw_channel_posix_unittest.cc
diff --git a/mojo/system/raw_channel_posix_unittest.cc b/mojo/system/raw_channel_posix_unittest.cc
index 16ebcf05ba13a5941f647399e9ba013e4db7ba68..a05a3f23a3f42dbceb9ddc8bc7e27557bd1138a9 100644
--- a/mojo/system/raw_channel_posix_unittest.cc
+++ b/mojo/system/raw_channel_posix_unittest.cc
@@ -45,7 +45,10 @@ MessageInTransit* MakeTestMessage(uint32_t num_bytes) {
   std::vector<unsigned char> bytes(num_bytes, 0);
   for (size_t i = 0; i < num_bytes; i++)
     bytes[i] = static_cast<unsigned char>(i + num_bytes);
-  return MessageInTransit::Create(bytes.data(), num_bytes);
+  return MessageInTransit::Create(
+      MessageInTransit::TYPE_MESSAGE_PIPE_ENDPOINT,
+      MessageInTransit::SUBTYPE_MESSAGE_PIPE_ENDPOINT_DATA,
+      bytes.data(), num_bytes);
 }
 
 bool CheckMessageData(const void* bytes, uint32_t num_bytes) {