Implement <appview> skeleton.

chrome/browser/guest_view/app_view/app_view_guest.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 CHROME_BROWSER_GUEST_VIEW_APP_VIEW_APP_VIEW_GUEST_H_
+#define CHROME_BROWSER_GUEST_VIEW_APP_VIEW_APP_VIEW_GUEST_H_
+
+#include "chrome/browser/guest_view/guest_view.h"
+
+class AppViewGuest : public GuestView<AppViewGuest> {
+ public:
+  static const char Type[];
+
+  AppViewGuest(content::BrowserContext* browser_context,
+               int guest_instance_id);
+
+  // GuestViewBase implementation.
+  virtual void CreateWebContents(
+      const std::string& embedder_extension_id,
+      int embedder_render_process_id,
+      const base::DictionaryValue& create_params,
+      const WebContentsCreatedCallback& callback) OVERRIDE;
+  virtual void DidAttachToEmbedder() OVERRIDE;
+
+ private:
+  virtual ~AppViewGuest();
+};
+
+#endif  // CHROME_BROWSER_GUEST_VIEW_APP_VIEW_APP_VIEW_GUEST_H_