Update from https://crrev.com/304121

gpu/ipc/gpu_command_buffer_traits.cc

 // Copyright (c) 2012 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 "gpu/ipc/gpu_command_buffer_traits.h"
+
 #include "gpu/command_buffer/common/mailbox_holder.h"
 
+// Generate param traits write methods.
+#include "ipc/param_traits_write_macros.h"
+namespace IPC {
+#include "gpu/ipc/gpu_command_buffer_traits_multi.h"
+}  // namespace IPC
+
+// Generate param traits read methods.
+#include "ipc/param_traits_read_macros.h"
+namespace IPC {
+#include "gpu/ipc/gpu_command_buffer_traits_multi.h"
+}  // namespace IPC
+
+// Generate param traits log methods.
+#include "ipc/param_traits_log_macros.h"
+namespace IPC {
+#include "gpu/ipc/gpu_command_buffer_traits_multi.h"
+}  // namespace IPC
+
 namespace IPC {
 
 void ParamTraits<gpu::CommandBuffer::State> ::Write(Message* m,
                                                     const param_type& p) {
   WriteParam(m, p.get_offset);
   WriteParam(m, p.token);
   WriteParam(m, static_cast<int32>(p.error));
   WriteParam(m, p.generation);
 }
 
@@ skipping 52 matching lines @@
     return false;
   return true;
 }
 
 void ParamTraits<gpu::MailboxHolder>::Log(const param_type& p, std::string* l) {
   ParamTraits<gpu::Mailbox>::Log(p.mailbox, l);
   *l += base::StringPrintf(":%04x@%d", p.texture_target, p.sync_point);
 }
 
 }  // namespace IPC