Extract ExtensionRequestSender from SchemaGeneratedBindings.

chrome/renderer/extensions/extension_request_sender.h

+// Copyright (c) 2012 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 CHROME_RENDERER_EXTENSIONS_EXTENSION_REQUEST_SENDER_H_
+#define CHROME_RENDERER_EXTENSIONS_EXTENSION_REQUEST_SENDER_H_
+#pragma once
+
+#include <string>
+#include <map>
+
+#include "base/memory/linked_ptr.h"
+#include "v8/include/v8.h"
+
+class ChromeV8ContextSet;
+class ExtensionDispatcher;
+
+namespace base {
+class ListValue;
+}
+
+struct PendingRequest;
+
+// Responsible for sending requests for named extension API functions to the
+// extension host and routing the responses back to the caller.
+class ExtensionRequestSender {
+ public:
+  explicit ExtensionRequestSender(ExtensionDispatcher* extension_dispatcher,
+                                  ChromeV8ContextSet* context_set);
+  ~ExtensionRequestSender();
+
+  // Makes a call to the API function |name| that is to be handled by the
+  // extension host. The response to this request will be received in
+  // HandleResponse().
+  // TODO(koz): Remove |request_id| and generate that internally.
+  void StartRequest(const std::string& name,
+                    int request_id,
+                    bool has_callback,
+                    bool for_io_thread,
+                    base::ListValue* value_args);
+
+  // Handles responses from the extension host to calls made by StartRequest().
+  void HandleResponse(int request_id,
+                      bool success,
+                      const std::string& response,
+                      const std::string& error);
+
+
+ private:
+  typedef std::map<int, linked_ptr<PendingRequest> > PendingRequestMap;
+
+  void InsertRequest(int request_id, PendingRequest* pending_request);
+  linked_ptr<PendingRequest> RemoveRequest(int request_id);
+
+  ExtensionDispatcher* extension_dispatcher_;
+  PendingRequestMap pending_requests_;
+  ChromeV8ContextSet* context_set_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExtensionRequestSender);
+};
+
+#endif  // CHROME_RENDERER_EXTENSIONS_EXTENSION_REQUEST_SENDER_H_