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

components/nacl/renderer/ppb_nacl_private.h

 // 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.
 
 #ifndef COMPONENTS_NACL_RENDERER_PPB_NACL_PRIVATE_H_
 #define COMPONENTS_NACL_RENDERER_PPB_NACL_PRIVATE_H_
 
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_instance.h"
@@ skipping 151 matching lines @@
  * @}
  */
 
 /**
  * @addtogroup Structs
  * @{
  */
 struct PP_PNaClOptions {
   PP_Bool translate;
   PP_Bool is_debug;
+  PP_Bool use_subzero;
   int32_t opt_level;
 };
 /**
  * @}
  */
 
 /**
  * @addtogroup Typedefs
  * @{
  */
@@ skipping 118 matching lines @@
    * plugin.
    */
   void (*ProcessNaClManifest)(PP_Instance instance, const char* program_url);
   PP_Bool (*GetManifestProgramURL)(PP_Instance instance,
                                    struct PP_Var* full_url,
                                    struct PP_PNaClOptions* pnacl_options,
                                    PP_Bool* uses_nonsfi_mode);
   /* Returns the filenames for the llc and ld tools. */
   PP_Bool (*GetPnaclResourceInfo)(PP_Instance instance,
                                   struct PP_Var* llc_tool_name,
-                                  struct PP_Var* ld_tool_name);
+                                  struct PP_Var* ld_tool_name,
+                                  struct PP_Var* subzero_tool_name);
   /* PP_Var string of attributes describing the CPU features supported
    * by the current architecture. The string is a comma-delimited list
    * of attributes supported by LLVM in its -mattr= option:
    *   http://llvm.org/docs/CommandGuide/llc.html#cmdoption-mattr */
   struct PP_Var (*GetCpuFeatureAttrs)(void);
   /* Downloads the .nexe file at the given URL to a file, and sets |file_info|
    * to information for a handle to a file containing its contents.
    * If metadata for identity-based validation caching is available
    * then it sets token information in |file_info| (otherwise left untouched).
    */
@@ skipping 29 matching lines @@
                      int32_t opt_level,
                      const struct PPP_PexeStreamHandler_1_0* stream_handler,
                      void* stream_handler_user_data);
 };
 /**
  * @}
  */
 
 #endif  /* PPAPI_C_PRIVATE_PPB_NACL_PRIVATE_H_ */