Add a switch for using PNaCl Subzero and use it for -O0 translation.

components/nacl/common/nacl_host_messages.h

 // Copyright 2013 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.
 
 // Multiply-included file, no traditional include guard.
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/process/process.h"
@@ skipping 31 matching lines @@
   IPC_STRUCT_TRAITS_MEMBER(crash_info_shmem_handle)
 IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_TRAITS_BEGIN(nacl::PnaclCacheInfo)
   IPC_STRUCT_TRAITS_MEMBER(pexe_url)
   IPC_STRUCT_TRAITS_MEMBER(abi_version)
   IPC_STRUCT_TRAITS_MEMBER(opt_level)
   IPC_STRUCT_TRAITS_MEMBER(last_modified)
   IPC_STRUCT_TRAITS_MEMBER(etag)
   IPC_STRUCT_TRAITS_MEMBER(has_no_store_header)
+  IPC_STRUCT_TRAITS_MEMBER(use_subzero)
   IPC_STRUCT_TRAITS_MEMBER(sandbox_isa)
   IPC_STRUCT_TRAITS_MEMBER(extra_flags)
 IPC_STRUCT_TRAITS_END()
 
 // A renderer sends this to the browser process when it wants to start
 // a new instance of the Native Client process. The browser will launch
 // the process and return an IPC channel handle. This handle will only
 // be valid if the NaCl IPC proxy is enabled.
 IPC_SYNC_MESSAGE_CONTROL1_2(NaClHostMsg_LaunchNaCl,
                             nacl::NaClLaunchParams /* launch_params */,
@@ skipping 54 matching lines @@
 // processors are online.
 IPC_SYNC_MESSAGE_CONTROL0_1(NaClHostMsg_NaClGetNumProcessors,
                             int /* Number of processors */)
 
 // A renderer sends this to the browser process to determine if the
 // NaCl application started from the given NMF URL will be debugged.
 // If not (filtered out by commandline flags), it sets should_debug to false.
 IPC_SYNC_MESSAGE_CONTROL1_1(NaClHostMsg_NaClDebugEnabledForURL,
                             GURL /* alleged URL of NMF file */,
                             bool /* should debug */)