Ntp: restore scroll position.

content/browser/frame_host/navigation_entry_impl.h

Index: content/browser/frame_host/navigation_entry_impl.h
diff --git a/content/browser/frame_host/navigation_entry_impl.h b/content/browser/frame_host/navigation_entry_impl.h
index 4c96d55e2b7342d18cd35e31ca6ae2b681e20e3f..4a778b4251f926dbc987bceb7d951d129f90596c 100644
--- a/content/browser/frame_host/navigation_entry_impl.h
+++ b/content/browser/frame_host/navigation_entry_impl.h
@@ -7,6 +7,8 @@
 
 #include <stdint.h>
 
+#include <map>
+
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_vector.h"
@@ -356,6 +358,10 @@ class CONTENT_EXPORT NavigationEntryImpl
   // Returns the history URL for a data URL to use in Blink.
   GURL GetHistoryURLForDataURL() const;
 
+  const std::map<std::string, base::string16>& get_extra_data() const {
+    return extra_data_;
+  }
+
 #if defined(OS_ANDROID)
   base::TimeTicks intent_received_timestamp() const {
     return intent_received_timestamp_;