[Extensions Bindings] Request JS execution from messaging bindings

extensions/shell/renderer/shell_extensions_renderer_client.h

 // Copyright 2014 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_SHELL_RENDERER_SHELL_EXTENSIONS_RENDERER_CLIENT_H_
 #define EXTENSIONS_SHELL_RENDERER_SHELL_EXTENSIONS_RENDERER_CLIENT_H_
 
+#include <memory>
+
 #include "base/macros.h"
 #include "extensions/renderer/extensions_renderer_client.h"
 
 namespace extensions {
+class Dispatcher;
+class DispatcherDelegate;
 
 class ShellExtensionsRendererClient : public ExtensionsRendererClient {
  public:
   ShellExtensionsRendererClient();
   ~ShellExtensionsRendererClient() override;
 
   // ExtensionsRendererClient implementation.
   bool IsIncognitoProcess() const override;
   int GetLowestIsolatedWorldId() const override;
+  Dispatcher* GetDispatcher() override;
 
  private:
+  std::unique_ptr<DispatcherDelegate> dispatcher_delegate_;
+  std::unique_ptr<Dispatcher> dispatcher_;
+
   DISALLOW_COPY_AND_ASSIGN(ShellExtensionsRendererClient);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_SHELL_RENDERER_SHELL_EXTENSIONS_RENDERER_CLIENT_H_