[Extensions Bindings] Support chrome.extension.lastError

extensions/renderer/bindings/api_bindings_system_unittest.h

 // Copyright 2017 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_BINDINGS_SYSTEM_UNITTEST_H_
 #define EXTENSIONS_RENDERER_BINDINGS_API_BINDINGS_SYSTEM_UNITTEST_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 27 matching lines @@
   APIBindingsSystemTest();
   ~APIBindingsSystemTest() override;
   void SetUp() override;
   void TearDown() override;
   void OnWillDisposeContext(v8::Local<v8::Context> context) override;
 
   // Returns the collection of fake APIs to be used in the test, allowing
   // subclasses to return their own specifications.
   virtual std::vector<FakeSpec> GetAPIs();
 
-  // Returns the object to be used as the parent for the `lastError`. The
-  // default returns an empty JS object (assumes no last errors will be set).
+  // Returns the object to be used as the parent for the `lastError`, and,
+  // optionally, the secondary parent. The default returns an empty JS object
+  // and does not populate |secondary_parent| (assumes no last errors will be
+  // set).
   virtual v8::Local<v8::Object> GetLastErrorParent(
-      v8::Local<v8::Context> context);
+      v8::Local<v8::Context> context,
+      v8::Local<v8::Object>* secondary_parent);
 
   // Returns the DictionaryValue representing the schema with the given API
   // name.
   const base::DictionaryValue& GetAPISchema(const std::string& api_name);
 
   // Callback for event listeners changing.
   void OnEventListenersChanged(const std::string& event_name,
                                binding::EventListenersChanged changed,
                                const base::DictionaryValue* filter,
                                bool was_manual,
@@ skipping 33 matching lines @@
   // The last request to be received from the APIBindingsSystem, or null if
   // there is none.
   std::unique_ptr<APIRequestHandler::Request> last_request_;
 
   DISALLOW_COPY_AND_ASSIGN(APIBindingsSystemTest);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_BINDINGS_API_BINDINGS_SYSTEM_UNITTEST_H_