Add is_srcdoc to FrameNavigationEntry and restore about::srcdoc URL.

content/browser/frame_host/navigation_request.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 CONTENT_BROWSER_FRAME_HOST_NAVIGATION_REQUEST_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATION_REQUEST_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 186 matching lines @@
   // will be set to the final navigation url, obtained after following all
   // redirects.
   // Note: |common_params_| and |begin_params_| are not const as they can be
   // modified during redirects.
   // Note: |request_params_| is not const because service_worker_provider_id
   // and should_create_service_worker will be set in OnResponseStarted.
   CommonNavigationParams common_params_;
   BeginNavigationParams begin_params_;
   RequestNavigationParams request_params_;
   const bool browser_initiated_;
+  bool is_srcdoc_;
 
   NavigationState state_;
 
 
   std::unique_ptr<NavigationURLLoader> loader_;
 
   // These next items are used in browser-initiated navigations to store
   // information from the NavigationEntryImpl that is required after request
   // creation time.
   scoped_refptr<SiteInstanceImpl> source_site_instance_;
@@ skipping 11 matching lines @@
   // the WillProcessResponse checks are performed by the NavigationHandle.
   scoped_refptr<ResourceResponse> response_;
   std::unique_ptr<StreamHandle> body_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationRequest);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATION_REQUEST_H_