Implement local NTP for fallback.

chrome/browser/instant/local_ntp_source.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 CHROME_BROWSER_INSTANT_LOCAL_NTP_SOURCE_H_
+#define CHROME_BROWSER_INSTANT_LOCAL_NTP_SOURCE_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "content/public/browser/url_data_source.h"
+
+// Serves HTML and resources for the local omnibox popup i.e.
+// chrome-search://local-ntp/local-ntp.html
+class LocalNTPSource : public content::URLDataSource {
+ public:
+  LocalNTPSource();
+
+  // content::URLDataSource overrides.
+  virtual std::string GetSource() OVERRIDE;
+  virtual void StartDataRequest(
+      const std::string& path,
+      bool is_incognito,
+      const content::URLDataSource::GotDataCallback& callback) OVERRIDE;
+  virtual std::string GetMimeType(const std::string& path) const OVERRIDE;
+  virtual bool ShouldServiceRequest(
+      const net::URLRequest* request) const OVERRIDE;
+
+ private:
+  virtual ~LocalNTPSource();
+
+  DISALLOW_COPY_AND_ASSIGN(LocalNTPSource);
+};
+
+#endif  // CHROME_BROWSER_INSTANT_LOCAL_NTP_SOURCE_H_