Remove dependency on m_previousPositionFromPaintInvalidationBacking for spv2

Source/core/paint/DeprecatedPaintLayer.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 757 matching lines @@
         positionOrOffsetChanged = newOffset != m_offsetForInFlowPosition;
         m_offsetForInFlowPosition = newOffset;
         localPoint.move(m_offsetForInFlowPosition);
     } else {
         m_offsetForInFlowPosition = LayoutSize();
     }
 
     // FIXME: We'd really like to just get rid of the concept of a layer rectangle and rely on the layoutObjects.
     localPoint.moveBy(-inlineBoundingBoxOffset);
 
-    if (m_location != localPoint)
+    if (m_location != localPoint) {
         positionOrOffsetChanged = true;
+        if (RuntimeEnabledFeatures::slimmingPaintV2Enabled())
+            setNeedsRepaint();
+    }
     m_location = localPoint;
 
 #if ENABLE(ASSERT)
     m_needsPositionUpdate = false;
 #endif
     return positionOrOffsetChanged;
 }
 
 TransformationMatrix DeprecatedPaintLayer::perspectiveTransform() const
 {
@@ skipping 1921 matching lines @@
 
 void showLayerTree(const blink::LayoutObject* layoutObject)
 {
     if (!layoutObject) {
         fprintf(stderr, "Cannot showLayerTree. Root is (nil)\n");
         return;
     }
     showLayerTree(layoutObject->enclosingLayer());
 }
 #endif