[Extensions] Make port creation synchronous in unload handlers

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 76 matching lines @@
   void RequestPortId(const ExtensionMsg_ExternalConnectionInfo& info,
                      const std::string& channel_name,
                      bool include_tls_channel_id,
                      const base::Callback<void(int)>& callback);
   void RequestTabPortId(const ExtensionMsg_TabTargetConnectionInfo& info,
                         const std::string& extension_id,
                         const std::string& channel_name,
                         const base::Callback<void(int)>& callback);
   void RequestNativeAppPortId(const std::string& native_app_name,
                               const base::Callback<void(int)>& callback);
+  int RequestSyncPortId(const ExtensionMsg_ExternalConnectionInfo& info,
+                        const std::string& channel_name,
+                        bool include_tls_channel_id);
 
  private:
   struct PendingPortRequest;
 
   // 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)
@@ skipping 62 matching lines @@
   bool delayed_main_world_script_initialization_ = false;
 
   base::WeakPtrFactory<ExtensionFrameHelper> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionFrameHelper);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_EXTENSION_FRAME_HELPER_H_