Added pinch viewport offset to history item.

public/web/WebView.h

 /*
  * Copyright (C) 2009, 2010, 2011, 2012 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 254 matching lines @@
     virtual WebFloatPoint pinchViewportOffset() const = 0;
 
     // PageScaleFactor will be force-clamped between minPageScale and maxPageScale
     // (and these values will persist until setPageScaleFactorLimits is called
     // again).
     virtual void setPageScaleFactorLimits(float minPageScale, float maxPageScale) = 0;
 
     virtual float minimumPageScaleFactor() const = 0;
     virtual float maximumPageScaleFactor() const = 0;
 
-    // Save the WebView's current scroll and scale state. Each call to this function
-    // overwrites the previously saved scroll and scale state.
-    virtual void saveScrollAndScaleState() = 0;
-
-    // Restore the previously saved scroll and scale state. After restoring the
-    // state, this function deletes any saved scroll and scale state.
-    virtual void restoreScrollAndScaleState() = 0;
-
     // Reset any saved values for the scroll and scale state.
     virtual void resetScrollAndScaleState() = 0;
 
     // Prevent the web page from setting min/max scale via the viewport meta
     // tag. This is an accessibility feature that lets folks zoom in to web
     // pages even if the web page tries to block scaling.
     virtual void setIgnoreViewportTagScaleLimits(bool) = 0;
 
     // Returns the "preferred" contents size, defined as the preferred minimum width of the main document's contents
     // and the minimum height required to display the main document without scrollbars.
@@ skipping 212 matching lines @@
 
     // Testing functionality for TestRunner ---------------------------------
 
 protected:
     ~WebView() {}
 };
 
 } // namespace blink
 
 #endif