Use float for scroll offset.

third_party/WebKit/Source/web/LinkHighlightImpl.cpp

 /*
  * Copyright (C) 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:
  *
  * 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
@@ skipping 246 matching lines @@
   computeQuads(*m_node, quads);
   DCHECK(quads.size());
   Path newPath;
 
   for (size_t quadIndex = 0; quadIndex < quads.size(); ++quadIndex) {
     FloatQuad absoluteQuad = quads[quadIndex];
 
     // Scrolling content layers have the same offset from layout object as the
     // non-scrolling layers. Thus we need to adjust for their scroll offset.
     if (m_isScrollingGraphicsLayer) {
-      DoubleSize adjustedScrollOffset = paintInvalidationContainer.layer()
-                                            ->getScrollableArea()
-                                            ->adjustedScrollOffset();
-      absoluteQuad.move(adjustedScrollOffset.width(),
-                        adjustedScrollOffset.height());
+      FloatPoint scrollPosition = paintInvalidationContainer.layer()
+                                      ->getScrollableArea()
+                                      ->scrollPosition();
+      absoluteQuad.move(toScrollOffset(scrollPosition));
     }
 
     // Transform node quads in target absolute coords to local coordinates in
     // the compositor layer.
     FloatQuad transformedQuad;
     convertTargetSpaceQuadToCompositedLayer(
         absoluteQuad, m_node->layoutObject(), paintInvalidationContainer,
         transformedQuad);
 
     // FIXME: for now, we'll only use rounded paths if we have a single node
@@ skipping 162 matching lines @@
 
 WebLayer* LinkHighlightImpl::layer() {
   return clipLayer();
 }
 
 CompositorAnimationPlayer* LinkHighlightImpl::compositorPlayer() const {
   return m_compositorPlayer.get();
 }
 
 }  // namespace blink