Add sandbox ISA and extra compile flag fields to PNaCl translation cache key

ppapi/native_client/src/trusted/plugin/pnacl_coordinator.cc

Index: ppapi/native_client/src/trusted/plugin/pnacl_coordinator.cc
diff --git a/ppapi/native_client/src/trusted/plugin/pnacl_coordinator.cc b/ppapi/native_client/src/trusted/plugin/pnacl_coordinator.cc
index 91112a0b67285f224c7ad29aaa0660ec0eef18b9..3461a19c67a309c16b725a666432d84ad6546f50 100644
--- a/ppapi/native_client/src/trusted/plugin/pnacl_coordinator.cc
+++ b/ppapi/native_client/src/trusted/plugin/pnacl_coordinator.cc
@@ -500,6 +500,8 @@ void PnaclCoordinator::ResourcesDidLoad(int32_t pp_error) {
           parser.GetHeader("last-modified").c_str(),
           parser.GetHeader("etag").c_str(),
           PP_FromBool(parser.CacheControlNoStore()),
+          GetSandboxISA(),
+          "", // No extra compile flags yet.
           &is_cache_hit_,
           temp_nexe_file_->existing_handle(),
           cb.pp_completion_callback());