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 9e96f0d77a7fcf153131818409d3cd5d10c3d075..50102ac0af4fadb69f2ade39cbbecdfe4c0351b6 100644
--- a/ppapi/native_client/src/trusted/plugin/pnacl_coordinator.cc
+++ b/ppapi/native_client/src/trusted/plugin/pnacl_coordinator.cc
@@ -492,6 +492,8 @@ 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());