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

content/browser/frame_host/navigation_entry_impl.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 CONTENT_BROWSER_FRAME_HOST_NAVIGATION_ENTRY_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATION_ENTRY_IMPL_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 208 matching lines @@
       FrameTreeNode* frame_tree_node,
       int64_t item_sequence_number,
       int64_t document_sequence_number,
       SiteInstanceImpl* site_instance,
       scoped_refptr<SiteInstanceImpl> source_site_instance,
       const GURL& url,
       const Referrer& referrer,
       const std::vector<GURL>& redirect_chain,
       const PageState& page_state,
       const std::string& method,
-      int64_t post_id);
+      int64_t post_id,
+      bool is_srcdoc);
 
   // Returns the FrameNavigationEntry corresponding to |frame_tree_node|, if
   // there is one in this NavigationEntry.
   FrameNavigationEntry* GetFrameEntry(FrameTreeNode* frame_tree_node) const;
 
   // Returns a map of frame unique names to |is_about_blank| for immediate
   // children of the TreeNode associated with |frame_tree_node|.  The renderer
   // process will use this list of names to know whether to ask the browser
   // process for a history item when new subframes are created during a
   // back/forward navigation.  (|is_about_blank| can be used to skip the request
@@ skipping 302 matching lines @@
   // persisted, unless specific data is taken out/put back in at save/restore
   // time (see TabNavigation for an example of this).
   std::map<std::string, base::string16> extra_data_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationEntryImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATION_ENTRY_IMPL_H_