Add a chrome://interstitials page.

chrome/browser/ui/webui/interstitials/interstitial_ui.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_UI_WEBUI_INTERSTITIALS_INTERSTITIAL_UI_H_
+#define CHROME_BROWSER_UI_WEBUI_INTERSTITIALS_INTERSTITIAL_UI_H_
+
+#include <string>
+
+#include "content/public/browser/url_data_source.h"
+#include "content/public/browser/web_ui_controller.h"
+
+class Profile;
+
+namespace content {
+class WebContents;
+}
+
+class InterstitialUI : public content::WebUIController {
+ public:
+  explicit InterstitialUI(content::WebUI* web_ui);
+
+  virtual ~InterstitialUI();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(InterstitialUI);
+};
+
+#endif  // CHROME_BROWSER_UI_WEBUI_INTERSTITIALS_INTERSTITIAL_UI_H_