Add a whitelist check for nacl-nonsfi mode

components/nacl/renderer/ppb_nacl_private_impl.cc

Index: components/nacl/renderer/ppb_nacl_private_impl.cc
diff --git a/components/nacl/renderer/ppb_nacl_private_impl.cc b/components/nacl/renderer/ppb_nacl_private_impl.cc
index a4020d98a2107166603d2ff9f0f9e684db40a14e..7ee3c779c6f1b1a50fa1f44f4b63c8769dc81afd 100644
--- a/components/nacl/renderer/ppb_nacl_private_impl.cc
+++ b/components/nacl/renderer/ppb_nacl_private_impl.cc
@@ -501,7 +501,13 @@ int32_t GetNumberOfProcessors() {
 }
 
 PP_Bool IsNonSFIModeEnabled() {
-#if defined(OS_LINUX)
+  // Note that this only indicates whether non-sfi mode *can* run for a given
+  // platform and if nonsfi manifest entries are preferred.  There can be other
+  // restrictions which prevent a particular module from launching.  See
+  // NaClProcessHost::Launch which makes the final determination.
+#if defined(OS_CHROMEOS) && defined(ARCH_CPU_ARM_FAMILY)

[Mark Seaborn, 2014/05/08 01:06:02]

Same comment as in other file

[elijahtaylor1, 2014/05/08 20:00:24]

Done.

+  return PP_TRUE;
+#elif defined(OS_LINUX) || defined(OS_CHROMEOS)

[Mark Seaborn, 2014/05/08 01:06:02]

Same here too

[elijahtaylor1, 2014/05/08 20:00:24]

Done.

   return PP_FromBool(CommandLine::ForCurrentProcess()->HasSwitch(
                          switches::kEnableNaClNonSfiMode));
 #else