[Extensions Bindings] Add chrome.runtime.lastError support

extensions/renderer/native_extension_bindings_system.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_NATIVE_EXTENSION_BINDINGS_SYSTEM_H_
 #define EXTENSIONS_RENDERER_NATIVE_EXTENSION_BINDINGS_SYSTEM_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 50 matching lines @@
   void SendRequest(std::unique_ptr<APIBinding::Request> request,
                    v8::Local<v8::Context> context);
 
   // Called when listeners for a given event have changed, and forwards it along
   // to |send_event_listener_ipc_|.
   void OnEventListenerChanged(const std::string& event_name,
                               binding::EventListenersChanged change,
                               v8::Local<v8::Context> context);
 
   // Getter callback for an extension API, since APIs are constructed lazily.
-  static void GetAPIHelper(v8::Local<v8::Name> name,
-                           const v8::PropertyCallbackInfo<v8::Value>& info);
+  static void BindingAccessor(v8::Local<v8::Name> name,
+                              const v8::PropertyCallbackInfo<v8::Value>& info);
+
+  // Creates and returns the API binding for the given |name|.
+  static v8::Local<v8::Object> GetAPIHelper(v8::Local<v8::Context> context,
+                                            v8::Local<v8::String> name);
+
+  // Gets the chrome.runtime API binding.
+  static v8::Local<v8::Object> GetRuntime(v8::Local<v8::Context> context);
 
   // Handler to send request IPCs. Abstracted out for testing purposes.
   SendRequestIPCMethod send_request_ipc_;
 
   // Handler to notify the browser of event registrations. Abstracted out for
   // testing purposes.
   SendEventListenerIPCMethod send_event_listener_ipc_;
 
   // The APIBindingsSystem associated with this class.
   APIBindingsSystem api_system_;
 
   base::WeakPtrFactory<NativeExtensionBindingsSystem> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeExtensionBindingsSystem);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_NATIVE_EXTENSION_BINDINGS_SYSTEM_H_