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

components/nacl/renderer/plugin/pnacl_coordinator.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_PLUGIN_PNACL_COORDINATOR_H_
 #define COMPONENTS_NACL_RENDERER_PLUGIN_PNACL_COORDINATOR_H_
 
 #include <vector>
 
 #include "components/nacl/renderer/plugin/nacl_subprocess.h"
@@ skipping 143 matching lines @@
   // Options for translation.
   PP_PNaClOptions pnacl_options_;
   // Architecture-specific attributes used for translation. These are
   // supplied by Chrome, not the developer, and are therefore different
   // from PNaCl options.
   std::string architecture_attributes_;
 
   // Object file, produced by the translator and consumed by the linker.
   std::vector<TempFile*> obj_files_;
   nacl::scoped_ptr<nacl::DescWrapper> invalid_desc_wrapper_;
-  // Number of split modules (threads) for llc
+  // Number of split modules for llc.
   int split_module_count_;
+  // Number of threads for llc / subzero.
+  int num_threads_;
 
   // Translated nexe file, produced by the linker.
   nacl::scoped_ptr<TempFile> temp_nexe_file_;
 
   // Used to report information when errors (PPAPI or otherwise) are reported.
   ErrorInfo error_info_;
 
   // True if an error was already reported, and translate_notify_callback_
   // was already run/consumed.
   bool error_already_reported_;
 
   // State for timing and size information for UMA stats.
   int64_t pexe_size_;  // Count as we stream -- will converge to pexe size.
   int64_t pexe_bytes_compiled_;  // Count as we compile.
   int64_t expected_pexe_size_;   // Expected download total (-1 if unknown).
 
   // The helper thread used to do translations via SRPC.
   // It accesses fields of PnaclCoordinator so it must have a
   // shorter lifetime.
   nacl::scoped_ptr<PnaclTranslateThread> translate_thread_;
 };
 
 //----------------------------------------------------------------------
 
 }  // namespace plugin;
 #endif  // COMPONENTS_NACL_RENDERER_PLUGIN_PNACL_COORDINATOR_H_