[Extensions] Begin making Extension port initialization asynchronous

extensions/renderer/extension_frame_helper.h

 // Copyright 2013 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_EXTENSION_FRAME_HELPER_H_
 #define EXTENSIONS_RENDERER_EXTENSION_FRAME_HELPER_H_
 
 #include <vector>
 
 #include "base/macros.h"
@@ skipping 63 matching lines @@
   // Schedule a callback, to be run at the next RunScriptsAtDocumentStart
   // notification. Only call this when you are certain that there will be such a
   // notification, e.g. from RenderFrameObserver::DidCreateDocumentElement.
   // Otherwise the callback is never invoked, or invoked for a document that you
   // were not expecting.
   void ScheduleAtDocumentStart(const base::Closure& callback);
 
   // Schedule a callback, to be run at the next RunScriptsAtDocumentEnd call.
   void ScheduleAtDocumentEnd(const base::Closure& callback);
 
+  // Sends a message to the browser requesting a port id. |callback| will be
+  // invoked with the global port id when the browser responds.
+  void RequestPortId(const ExtensionMsg_ExternalConnectionInfo& info,
+                     const std::string& channel_name,
+                     bool include_tls_channel_id,
+                     const base::Callback<void(int)>& callback);
+
  private:
   // RenderFrameObserver implementation.
   void DidCreateDocumentElement() override;
   void DidCreateNewDocument() override;
   void DidMatchCSS(
       const blink::WebVector<blink::WebString>& newly_matching_selectors,
       const blink::WebVector<blink::WebString>& stopped_matching_selectors)
           override;
   void DidCreateScriptContext(v8::Local<v8::Context>,
                               int extension_group,
@@ skipping 20 matching lines @@
   void OnNotifyRendererViewType(ViewType view_type);
   void OnExtensionResponse(int request_id,
                            bool success,
                            const base::ListValue& response,
                            const std::string& error);
   void OnExtensionMessageInvoke(const std::string& extension_id,
                                 const std::string& module_name,
                                 const std::string& function_name,
                                 const base::ListValue& args,
                                 bool user_gesture);
+  void OnAssignPortId(int port_id, int request_id);
 
   // Type of view associated with the RenderFrame.
   ViewType view_type_;
 
   // The id of the tab the render frame is attached to.
   int tab_id_;
 
   // The id of the browser window the render frame is attached to.
   int browser_window_id_;
 
   Dispatcher* extension_dispatcher_;
 
   // Whether or not the current document element has been created.
   bool did_create_current_document_element_;
 
   // Callbacks to be run at the next RunScriptsAtDocumentStart notification.
   std::vector<base::Closure> document_element_created_callbacks_;
 
   // Callbacks to be run at the next RunScriptsAtDocumentEnd notification.
   std::vector<base::Closure> document_load_finished_callbacks_;
 
+  // Counter for port requests.
+  int next_port_request_id_;
+
+  // Map of port requests to callbacks.
+  std::map<int, base::Callback<void(int)>> pending_port_requests_;
+
   base::WeakPtrFactory<ExtensionFrameHelper> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionFrameHelper);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_EXTENSION_FRAME_HELPER_H_