Adds support for media permission request handling on <appview> tag.

extensions/shell/browser/shell_extensions_api_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_BROWSER_SHELL_EXTENSIONS_API_CLIENT_H_
+#define EXTENSIONS_SHELL_BROWSER_SHELL_EXTENSIONS_API_CLIENT_H_
+
+#include "extensions/browser/api/extensions_api_client.h"
+
+namespace extensions {
+
+class ShellExtensionsAPIClient : public ExtensionsAPIClient {
+ public:
+  ShellExtensionsAPIClient();
+
+  // ExtensionsAPIClient implementation.
+  AppViewGuestDelegate* CreateAppViewGuestDelegate() const override;
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_SHELL_BROWSER_SHELL_EXTENSIONS_API_CLIENT_H_