[GPU] Get GPU process running on the mac...

gpu/command_buffer/common/cmd_buffer_common.cc

 // Copyright (c) 2009 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.
 
 // This file contains the binary format definition of the command buffer and
 // command buffer commands.
 
 #include "gpu/command_buffer/common/cmd_buffer_common.h"
 
 namespace gpu {
-const int32 CommandHeader::kMaxSize = (1 << 21) - 1;
-
+#if !defined(OS_WIN)
+// gcc needs this to link, but MSVC requires it not be present
+const int32 CommandHeader::kMaxSize;
+#endif
 namespace cmd {
 
 const char* GetCommandName(CommandId command_id) {
   static const char* const names[] = {
   #define COMMON_COMMAND_BUFFER_CMD_OP(name) # name,
 
   COMMON_COMMAND_BUFFER_CMDS(COMMON_COMMAND_BUFFER_CMD_OP)
 
   #undef COMMON_COMMAND_BUFFER_CMD_OP
   };
 
   int id = static_cast<int>(command_id);
   return (id >= 0 && id < kNumCommands) ? names[id] : "*unknown-command*";
 }
 
 }  // namespace cmd
 }  // namespace gpu