Added pinch viewport offset to history item.

Source/web/WebViewImpl.h

 /*
  * Copyright (C) 2010 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 171 matching lines @@
     virtual void setInitialPageScaleOverride(float) OVERRIDE;
     virtual bool zoomToMultipleTargetsRect(const WebRect&) OVERRIDE;
     virtual float pageScaleFactor() const OVERRIDE;
     virtual void setPageScaleFactorLimits(float minPageScale, float maxPageScale) OVERRIDE;
     virtual void setMainFrameScrollOffset(const WebPoint&) OVERRIDE;
     virtual void setPageScaleFactor(float) OVERRIDE;
     virtual void setPinchViewportOffset(const WebFloatPoint&) OVERRIDE;
     virtual WebFloatPoint pinchViewportOffset() const OVERRIDE;
     virtual float minimumPageScaleFactor() const OVERRIDE;
     virtual float maximumPageScaleFactor() const OVERRIDE;
-    virtual void saveScrollAndScaleState() OVERRIDE;
-    virtual void restoreScrollAndScaleState() OVERRIDE;
     virtual void resetScrollAndScaleState() OVERRIDE;
     virtual void setIgnoreViewportTagScaleLimits(bool) OVERRIDE;
     virtual WebSize contentsPreferredMinimumSize() OVERRIDE;
 
     virtual float deviceScaleFactor() const OVERRIDE;
     virtual void setDeviceScaleFactor(float) OVERRIDE;
 
     virtual void setFixedLayoutSize(const WebSize&) OVERRIDE;
 
     virtual void enableAutoResizeMode(
@@ skipping 416 matching lines @@
     // Keeps track of the current zoom level. 0 means no zoom, positive numbers
     // mean zoom in, negative numbers mean zoom out.
     double m_zoomLevel;
 
     double m_minimumZoomLevel;
 
     double m_maximumZoomLevel;
 
     PageScaleConstraintsSet m_pageScaleConstraintsSet;
 
-    // Saved page scale state.
-    float m_savedPageScaleFactor; // 0 means that no page scale factor is saved.
-    WebCore::IntSize m_savedScrollOffset;
-
     // The scale moved to by the latest double tap zoom, if any.
     float m_doubleTapZoomPageScaleFactor;
     // Have we sent a double-tap zoom and not yet heard back the scale?
     bool m_doubleTapZoomPending;
 
     // Used for testing purposes.
     bool m_enableFakePageScaleAnimationForTesting;
     WebCore::IntPoint m_fakePageScaleAnimationTargetPosition;
     float m_fakePageScaleAnimationPageScaleFactor;
     bool m_fakePageScaleAnimationUseAnchor;
@@ skipping 86 matching lines @@
     bool m_userGestureObserved;
 };
 
 // We have no ways to check if the specified WebView is an instance of
 // WebViewImpl because WebViewImpl is the only implementation of WebView.
 DEFINE_TYPE_CASTS(WebViewImpl, WebView, webView, true, true);
 
 } // namespace blink
 
 #endif