[Extensions Bindings] Check availability of custom API properties

extensions/renderer/bindings/api_binding.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EXTENSIONS_RENDERER_BINDINGS_API_BINDING_H_
 #define EXTENSIONS_RENDERER_BINDINGS_API_BINDING_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 64 matching lines @@
   v8::Local<v8::Object> CreateInstance(v8::Local<v8::Context> context);
 
   APIBindingHooks* hooks() { return binding_hooks_.get(); }
 
  private:
   // Initializes the object_template_ for this API. Called lazily when the
   // first instance is created.
   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>,
                              const v8::PropertyCallbackInfo<v8::Value>& info);
 
   // Handler for getting the v8::Object associated with a custom property on the
   // API.
   static void GetCustomPropertyObject(
       v8::Local<v8::Name> property,
       const v8::PropertyCallbackInfo<v8::Value>& info);
@@ skipping 55 matching lines @@
   v8::Eternal<v8::ObjectTemplate> object_template_;
 
   base::WeakPtrFactory<APIBinding> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(APIBinding);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_BINDINGS_API_BINDING_H_