Add DidSaveScrollOrScaleState flag to prevent restoreScrollPositionAndViewState restore from default

third_party/WebKit/Source/core/loader/FrameLoader.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) Research In Motion Limited 2009. All rights reserved.
  * Copyright (C) 2011 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:
@@ skipping 185 matching lines @@
                                        SameDocumentNavigationSource,
                                        PassRefPtr<SerializedScriptValue>,
                                        HistoryScrollRestorationType,
                                        FrameLoadType,
                                        Document*);
 
   HistoryItem* currentItem() const { return m_currentItem.get(); }
   void saveScrollState();
 
   void restoreScrollPositionAndViewState();
+  void setScrollFromNavigation(const KURL* = nullptr,
+                               LoadStartType = NavigationToDifferentDocument);
 
   bool shouldContinueForNavigationPolicy(const ResourceRequest&,
                                          const SubstituteData&,
                                          DocumentLoader*,
                                          ContentSecurityPolicyDisposition,
                                          NavigationType,
                                          NavigationPolicy,
                                          bool shouldReplaceCurrentEntry,
                                          bool isClientRedirect,
                                          HTMLFormElement*);
@@ skipping 106 matching lines @@
   SandboxFlags m_forcedSandboxFlags;
 
   bool m_dispatchingDidClearWindowObjectInMainWorld;
   bool m_protectProvisionalLoader;
   bool m_isNavigationHandledByClient;
 };
 
 }  // namespace blink
 
 #endif  // FrameLoader_h