Revert of Removed unused ScrollAnimatorMac methods.

Source/platform/mac/ScrollAnimatorMac.mm

 /*
  * Copyright (C) 2010, 2011 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 111 matching lines @@
 
 - (NSRect)bounds
 {
     if (!_animator)
         return NSZeroRect;
 
     blink::FloatPoint currentPosition = _animator->currentPosition();
     return NSMakeRect(currentPosition.x(), currentPosition.y(), 0, 0);
 }
 
+- (void)_immediateScrollToPoint:(NSPoint)newPosition
+{
+    if (!_animator)
+        return;
+    _animator->immediateScrollToPointForScrollAnimation(newPosition);
+}
+
 - (NSPoint)_pixelAlignProposedScrollPosition:(NSPoint)newOrigin
 {
     return newOrigin;
 }
 
 - (NSSize)convertSizeToBase:(NSSize)size
 {
     return abs(size);
 }
 
@@ skipping 613 matching lines @@
         return;
 
     FloatSize delta = FloatSize(adjustedPosition.x() - m_currentPosX, adjustedPosition.y() - m_currentPosY);
 
     m_currentPosX = adjustedPosition.x();
     m_currentPosY = adjustedPosition.y();
     notifyContentAreaScrolled(delta);
     notifyPositionChanged();
 }
 
+void ScrollAnimatorMac::immediateScrollToPointForScrollAnimation(const FloatPoint& newPosition)
+{
+    ASSERT(m_scrollAnimationHelper);
+    immediateScrollTo(newPosition);
+}
+
 void ScrollAnimatorMac::contentAreaWillPaint() const
 {
     if (!scrollableArea()->scrollbarsCanBeActive())
         return;
     if (ScrollbarThemeMacCommon::isOverlayAPIAvailable())
         [m_scrollbarPainterController.get() contentAreaWillDraw];
 }
 
 void ScrollAnimatorMac::mouseEnteredContentArea() const
 {
@@ skipping 379 matching lines @@
         return;
 
     m_visibleScrollerThumbRect = rectInViewCoordinates;
 }
 
 bool ScrollAnimatorMac::canUseCoordinatedScrollbar() {
     return ScrollbarThemeMacCommon::isOverlayAPIAvailable();
 }
 
 } // namespace blink