Adding a new message type to the Mojo channel.

mojo/edk/system/node_channel.cc

 // Copyright 2016 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 "mojo/edk/system/node_channel.h"
 
 #include <cstring>
 #include <limits>
 #include <sstream>
 
@@ skipping 37 matching lines @@
   PORTS_MESSAGE_FROM_RELAY,
 #endif
   ACCEPT_PEER,
 };
 
 struct Header {
   MessageType type;
   uint32_t padding;
 };
 
-static_assert(sizeof(Header) % kChannelMessageAlignment == 0,
-    "Invalid header size.");
+static_assert(IsAlignedForChannelMessage(sizeof(Header)),
+              "Invalid header size.");
 
 struct AcceptChildData {
   ports::NodeName parent_name;
   ports::NodeName token;
 };
 
 struct AcceptParentData {
   ports::NodeName token;
   ports::NodeName child_name;
 };
@@ skipping 825 matching lines @@
 
   base::AutoLock lock(channel_lock_);
   if (!channel_)
     DLOG(ERROR) << "Dropping message on closed channel.";
   else
     channel_->Write(std::move(message));
 }
 
 }  // namespace edk
 }  // namespace mojo