Add DidSaveScrollOrScaleState flag to prevent restoreScrollPositionAndViewState restore from default

third_party/WebKit/public/web/WebHistoryItem.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 98 matching lines @@
   BLINK_EXPORT void setStateObject(const WebSerializedScriptValue&);
 
   BLINK_EXPORT WebString httpContentType() const;
   BLINK_EXPORT void setHTTPContentType(const WebString&);
 
   BLINK_EXPORT WebHTTPBody httpBody() const;
   BLINK_EXPORT void setHTTPBody(const WebHTTPBody&);
 
   BLINK_EXPORT WebVector<WebString> getReferencedFilePaths() const;
 
+  BLINK_EXPORT bool didSaveScrollOrScaleState() const;
+  BLINK_EXPORT void setDidSaveScrollOrScaleState(bool);
+
 #if BLINK_IMPLEMENTATION
   BLINK_EXPORT WebHistoryItem(HistoryItem*);
   BLINK_EXPORT WebHistoryItem& operator=(HistoryItem*);
   BLINK_EXPORT operator HistoryItem*() const;
 #endif
 
  private:
   WebPrivatePtr<HistoryItem> m_private;
 };
 
 }  // namespace blink
 
 #endif