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;
+
+// Calls a named extension API method in the browser.

[benwells, 2012/03/29 23:06:36]

... and routes the responses back to the caller.

[koz (OOO until 15th September), 2012/03/29 23:55:46]

Done.

+class ExtensionRequestSender {
+ public:
+  explicit ExtensionRequestSender(ExtensionDispatcher* extension_dispatcher,
+                                  ChromeV8ContextSet* context_set);
+  ~ExtensionRequestSender();
+
+  void HandleResponse(int request_id,

[benwells, 2012/03/29 23:06:36]

Would be nice to document how these two methods are called.

subjective nit: I'd list the StartRequest method.

[koz (OOO until 15th September), 2012/03/29 23:55:46]

Done.

+                      bool success,
+                      const std::string& response,
+                      const std::string& error);
+
+  void StartRequest(const std::string& name,
+                    int request_id,

[benwells, 2012/03/29 23:06:36]

Could you also move the GetNextRequestId stuff in here? Or even remove it from
the interface (i.e. autogenerate it and return it from StartRequest).

If not would be good to document this parameter a bit (i.e. the fact that it has
to be unique)

[koz (OOO until 15th September), 2012/03/29 23:55:46]

As discussed, I'll do this in a follow-up CL. I've added a TODO to remove this
parameter.

+                    bool has_callback,
+                    bool for_io_thread,
+                    base::ListValue* value_args);
+
+
+ private:
+  typedef std::map<int, linked_ptr<PendingRequest> > PendingRequestMap;
+
+  void InsertRequest(int request_id, PendingRequest* pending_request);
+  PendingRequest* GetPendingRequest(int request_id);
+  void 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_