Add a simple one shot and repeating timer API for Mojo.js.

mojo/apps/js/bindings/core.cc

Index: mojo/apps/js/bindings/core.cc
diff --git a/mojo/apps/js/bindings/core.cc b/mojo/apps/js/bindings/core.cc
index ddca980bf54fcf0b693dff692ac5c4c5eb8282bf..1645b46703364e46bdbdba3d0ff90e4c73892eb2 100644
--- a/mojo/apps/js/bindings/core.cc
+++ b/mojo/apps/js/bindings/core.cc
@@ -88,7 +88,7 @@ gin::WrapperInfo g_wrapper_info = { gin::kEmbedderNativeGin };
 
 const char Core::kModuleName[] = "mojo/apps/js/bindings/core";
 
-v8::Local<v8::ObjectTemplate> Core::GetTemplate(v8::Isolate* isolate) {
+v8::Local<v8::Value> Core::GetModule(v8::Isolate* isolate) {
   gin::PerIsolateData* data = gin::PerIsolateData::From(isolate);
   v8::Local<v8::ObjectTemplate> templ = data->GetObjectTemplate(
       &g_wrapper_info);
@@ -141,7 +141,7 @@ v8::Local<v8::ObjectTemplate> Core::GetTemplate(v8::Isolate* isolate) {
     data->SetObjectTemplate(&g_wrapper_info, templ);
   }
 
-  return templ;
+  return templ->NewInstance();
 }
 
 }  // namespace js