DO NOT COMMIT: hack hack hacking on preloading md-settings

content/public/browser/url_data_source.h

 // Copyright (c) 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 CONTENT_PUBLIC_BROWSER_URL_DATA_SOURCE_H_
 #define CONTENT_PUBLIC_BROWSER_URL_DATA_SOURCE_H_
 
 #include <string>
+#include <vector>
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "content/common/content_export.h"
 
 namespace base {
 class MessageLoop;
 class RefCountedMemory;
 }
 
@@ skipping 92 matching lines @@
   virtual std::string GetContentSecurityPolicyChildSrc() const;
   // By default empty. Override to change this.
   virtual std::string GetContentSecurityPolicyStyleSrc() const;
   // By default empty. Override to change this.
   virtual std::string GetContentSecurityPolicyImgSrc() const;
 
   // By default, the "X-Frame-Options: DENY" header is sent. To stop this from
   // happening, return false. It is OK to return false as needed.
   virtual bool ShouldDenyXFrameOptions() const;
 
+  virtual std::vector<std::string> GetPreloadHeaders() const;
+
   // By default, only chrome: and chrome-devtools: requests are allowed.
   // Override in specific WebUI data sources to enable for additional schemes or
   // to implement fancier access control.  Typically used in concert with
   // ContentBrowserClient::GetAdditionalWebUISchemes() to permit additional
   // WebUI scheme support for an embedder.
   virtual bool ShouldServiceRequest(const net::URLRequest* request) const;
 
   // By default, Content-Type: header is not sent along with the response.
   // To start sending mime type returned by GetMimeType in HTTP headers,
   // return true. It is useful when tunneling response served from this data
@@ skipping 14 matching lines @@
   // Gives the source an opportunity to rewrite |path| to incorporate extra
   // information from the URLRequest prior to serving.
   virtual void WillServiceRequest(
       const net::URLRequest* request,
       std::string* path) const {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_URL_DATA_SOURCE_H_