[Extensions Bindings] Add chrome.runtime.lastError support

extensions/renderer/api_request_handler.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_API_REQUEST_HANDLER_H_
 #define EXTENSIONS_RENDERER_API_REQUEST_HANDLER_H_
 
 #include <map>
 #include <memory>
 #include <set>
 
 #include "base/callback.h"
 #include "base/macros.h"
+#include "extensions/renderer/api_last_error.h"
 #include "v8/include/v8.h"
 
 namespace base {
 class ListValue;
 }
 
 namespace extensions {
 
 // A wrapper around a map for extension API calls. Contains all pending requests
 // and the associated context and callback. Designed to be used on a single
 // thread, but amongst multiple contexts.
 class APIRequestHandler {
  public:
   using CallJSFunction = base::Callback<void(v8::Local<v8::Function>,
                                              v8::Local<v8::Context>,
                                              int argc,
                                              v8::Local<v8::Value>[])>;
 
-  explicit APIRequestHandler(const CallJSFunction& call_js);
+  APIRequestHandler(const CallJSFunction& call_js, APILastError last_error);
   ~APIRequestHandler();
 
   // Adds a pending request to the map. Returns a unique identifier for that
   // request.
   int AddPendingRequest(v8::Isolate* isolate,
                         v8::Local<v8::Function> callback,
                         v8::Local<v8::Context> context,
                         const std::vector<v8::Local<v8::Value>>& callback_args);
 
   // Responds to the request with the given |request_id|, calling the callback
   // with the given |response| arguments.
   // Invalid ids are ignored.
-  void CompleteRequest(int request_id, const base::ListValue& response);
+  void CompleteRequest(int request_id,
+                       const base::ListValue& response,
+                       const std::string& error);
 
   // Invalidates any requests that are associated with |context|.
   void InvalidateContext(v8::Local<v8::Context> context);
 
   std::set<int> GetPendingRequestIdsForTesting() const;
 
  private:
   struct PendingRequest {
     PendingRequest(v8::Isolate* isolate,
                    v8::Local<v8::Function> callback,
@@ skipping 14 matching lines @@
 
   // A map of all pending requests.
   std::map<int, PendingRequest> pending_requests_;
 
   // The method to call into a JS with specific arguments. We curry this in
   // because the manner we want to do this is a unittest (e.g.
   // v8::Function::Call) can be significantly different than in production
   // (where we have to deal with e.g. blocking javascript).
   CallJSFunction call_js_;
 
+  APILastError last_error_;
+
   DISALLOW_COPY_AND_ASSIGN(APIRequestHandler);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_API_REQUEST_HANDLER_H_