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

components/nacl/browser/pnacl_translation_cache_unittest.cc

 // 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.
 
 #include "components/nacl/browser/pnacl_translation_cache.h"
 
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
@@ skipping 159 matching lines @@
   info.abi_version = 2;
   EXPECT_EQ("ABI:2;opt:0;URL:http://www.google.com/;"
             "modified:1995:11:15:6:25:24:0:UTC;etag:;"
             "sandbox:x86-32;extra_flags:;",
             PnaclTranslationCache::GetKey(info));
   info.opt_level = 2;
   EXPECT_EQ("ABI:2;opt:2;URL:http://www.google.com/;"
             "modified:1995:11:15:6:25:24:0:UTC;etag:;"
             "sandbox:x86-32;extra_flags:;",
             PnaclTranslationCache::GetKey(info));
+  // Check that Subzero gets a different cache key.
+  info.use_subzero = true;
+  EXPECT_EQ("ABI:2;opt:2subzero;URL:http://www.google.com/;"
+            "modified:1995:11:15:6:25:24:0:UTC;etag:;"
+            "sandbox:x86-32;extra_flags:;",
+            PnaclTranslationCache::GetKey(info));
+  info.use_subzero = false;
   info.etag = std::string("etag");
   EXPECT_EQ("ABI:2;opt:2;URL:http://www.google.com/;"
             "modified:1995:11:15:6:25:24:0:UTC;etag:etag;"
             "sandbox:x86-32;extra_flags:;",
             PnaclTranslationCache::GetKey(info));
 
   info.extra_flags = "-mavx-neon";
   EXPECT_EQ("ABI:2;opt:2;URL:http://www.google.com/;"
             "modified:1995:11:15:6:25:24:0:UTC;etag:etag;"
             "sandbox:x86-32;extra_flags:-mavx-neon;",
@@ skipping 102 matching lines @@
   StoreNexe(test_key, test_store_val);
   TestNexeCallback load_cb;
   std::string nexe;
   cache_->GetNexe(test_key + "a", load_cb.callback());
   int rv;
   scoped_refptr<net::DrainableIOBuffer> buf(load_cb.GetResult(&rv));
   EXPECT_EQ(net::ERR_FAILED, rv);
 }
 
 }  // namespace pnacl