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

chrome/test/nacl/nacl_browsertest_util.h

Index: chrome/test/nacl/nacl_browsertest_util.h
diff --git a/chrome/test/nacl/nacl_browsertest_util.h b/chrome/test/nacl/nacl_browsertest_util.h
index 703bada78e26810a3ecdd2f02c39501ee8d48986..b40bf89ba878323e0fe78353f829a066aaf70683 100644
--- a/chrome/test/nacl/nacl_browsertest_util.h
+++ b/chrome/test/nacl/nacl_browsertest_util.h
@@ -123,6 +123,14 @@ class NaClBrowserTestPnacl : public NaClBrowserTestBase {
   bool IsAPnaclTest() override;
 };
 
+// TODO(jvoung): We can remove this and test the Subzero translator
+// with NaClBrowserTestPnacl once Subzero is automatically chosen
+// (not behind a flag).
+class NaClBrowserTestPnaclSubzero : public NaClBrowserTestPnacl {
+ public:
+  void SetUpCommandLine(base::CommandLine* command_line) override;
+};
+
 class NaClBrowserTestPnaclNonSfi : public NaClBrowserTestBase {
  public:
   void SetUpCommandLine(base::CommandLine* command_line) override;