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

chrome/test/nacl/nacl_browsertest.cc

Index: chrome/test/nacl/nacl_browsertest.cc
diff --git a/chrome/test/nacl/nacl_browsertest.cc b/chrome/test/nacl/nacl_browsertest.cc
index bfacf17e206eb55b865b748efb3befe6ed9cb220..92ace7a10f2ae279fd8b13e5305b3ba31f88221d 100644
--- a/chrome/test/nacl/nacl_browsertest.cc
+++ b/chrome/test/nacl/nacl_browsertest.cc
@@ -142,11 +142,11 @@ NACL_BROWSER_TEST_F(NaClBrowserTest, MAYBE_CrashViaCheckFailure, {
 })
 
 NACL_BROWSER_TEST_F(NaClBrowserTest, MAYBE_CrashViaExitCall, {
-  RunNaClIntegrationTest( FILE_PATH_LITERAL("ppapi_crash_via_exit_call.html"));
+  RunNaClIntegrationTest(FILE_PATH_LITERAL("ppapi_crash_via_exit_call.html"));
 })
 
 NACL_BROWSER_TEST_F(NaClBrowserTest, MAYBE_CrashInCallback, {
-  RunNaClIntegrationTest( FILE_PATH_LITERAL("ppapi_crash_in_callback.html"));
+  RunNaClIntegrationTest(FILE_PATH_LITERAL("ppapi_crash_in_callback.html"));
 })
 
 NACL_BROWSER_TEST_F(NaClBrowserTest, MAYBE_CrashOffMainThread, {
@@ -396,6 +396,13 @@ IN_PROC_BROWSER_TEST_F(NaClBrowserTestPnacl,
   RunLoadTest(FILE_PATH_LITERAL("pnacl_options.html?use_nmf=o_large"));
 }
 
+// Test Subzero. Subzero is triggered by the O0 option so reuse that test
+// pexe and test harness.
+IN_PROC_BROWSER_TEST_F(NaClBrowserTestPnaclSubzero,

[Nick Bray (chromium), 2015/03/27 20:30:42]

Put this next to the original so the diff is  more obvious?

[jvoung (off chromium), 2015/03/28 01:18:34]

Done.

+                       MAYBE_PNACL(PnaclNMFOptionsO0)) {
+  RunLoadTest(FILE_PATH_LITERAL("pnacl_options.html?use_nmf=o_0"));

[Nick Bray (chromium), 2015/03/27 20:30:42]

Naively, I would have expected this tests to do some sort of smoke test
postMessage "ping" to check the nexe is alive afterwards...

[jvoung (off chromium), 2015/03/28 01:18:34]

Good point.

I could make a separate pexe, or I could enhance the simple.cc test (though I
guess that would cascade to about 3 other test html/js).

+}
+
 IN_PROC_BROWSER_TEST_F(NaClBrowserTestPnacl,
                        MAYBE_PNACL(PnaclDyncodeSyscallDisabled)) {
   RunNaClIntegrationTest(FILE_PATH_LITERAL(