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

chrome/test/nacl/nacl_browsertest_util.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 "chrome/test/nacl/nacl_browsertest_util.h"
 
 #include <stdlib.h>
 #include "base/command_line.h"
 #include "base/json/json_reader.h"
 #include "base/path_service.h"
@@ skipping 265 matching lines @@
 }
 
 base::FilePath::StringType NaClBrowserTestPnacl::Variant() {
   return FILE_PATH_LITERAL("pnacl");
 }
 
 bool NaClBrowserTestPnacl::IsAPnaclTest() {
   return true;
 }
 
+void NaClBrowserTestPnaclSubzero::SetUpCommandLine(
+    base::CommandLine* command_line) {
+  NaClBrowserTestPnacl::SetUpCommandLine(command_line);
+  command_line->AppendSwitch(switches::kEnablePNaClSubzero);
+}
+
 base::FilePath::StringType NaClBrowserTestNonSfiMode::Variant() {
   return FILE_PATH_LITERAL("libc-free");
 }
 
 void NaClBrowserTestNonSfiMode::SetUpCommandLine(
     base::CommandLine* command_line) {
   NaClBrowserTestBase::SetUpCommandLine(command_line);
   command_line->AppendSwitch(switches::kEnableNaClNonSfiMode);
 }
 
@@ skipping 62 matching lines @@
   // to point at the isolated the test extension directory.
   // Otherwise, multiple NaCl extensions tests will end up sharing the
   // same directory when loading the extension files.
   base::FilePath document_root;
   ASSERT_TRUE(GetDocumentRoot(&document_root));
 
   // Document root is relative to source root, and source root may not be CWD.
   command_line->AppendSwitchPath(switches::kLoadExtension,
                                  src_root.Append(document_root));
 }