[Extensions Bindings] Check availability of custom API properties

extensions/renderer/bindings/api_binding.h

Index: extensions/renderer/bindings/api_binding.h
diff --git a/extensions/renderer/bindings/api_binding.h b/extensions/renderer/bindings/api_binding.h
index 3412e6e2133c6be1e54eb502fdd707a8e63bcbbd..5b71373e41a0b69970942c8ae0a2d9c9f5eed8ec 100644
--- a/extensions/renderer/bindings/api_binding.h
+++ b/extensions/renderer/bindings/api_binding.h
@@ -82,10 +82,12 @@ class APIBinding {
   void InitializeTemplate(v8::Isolate* isolate);
 
   // Decorates |object_template| with the properties specified by |properties|.
+  // |path| represents the current path the object from the API root.
   void DecorateTemplateWithProperties(
       v8::Isolate* isolate,
       v8::Local<v8::ObjectTemplate> object_template,
-      const base::DictionaryValue& properties);
+      const base::DictionaryValue& properties,
+      const std::string& path);
 
   // Handler for getting the v8::Object associated with an event on the API.
   static void GetEventObject(v8::Local<v8::Name>,