Use float for scroll offset.

third_party/WebKit/Source/core/paint/PaintLayerClipper.cpp

Index: third_party/WebKit/Source/core/paint/PaintLayerClipper.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintLayerClipper.cpp b/third_party/WebKit/Source/core/paint/PaintLayerClipper.cpp
index e9c5f0efd901958fc5669532ea44fbc6c199493f..4cd2d1b8b9f4570766ee5db7173c719d48d336e1 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayerClipper.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintLayerClipper.cpp
@@ -79,7 +79,7 @@ static void applyClipRects(const ClipRectsContext& context,
   LayoutView* view = layoutObject.view();
   DCHECK(view);
   if (clipRects.fixed() && context.rootLayer->layoutObject() == view)
-    offset -= toIntSize(view->frameView()->scrollPosition());
+    offset -= LayoutSize(view->frameView()->scrollOffset());
   if (layoutObject.hasOverflowClip() ||
       (layoutObject.isSVGRoot() &&
        toLayoutSVGRoot(&layoutObject)->shouldApplyViewportClip()) ||
@@ -348,7 +348,7 @@ ClipRect PaintLayerClipper::backgroundClipRect(
   if (parentClipRects->fixed() &&
       context.rootLayer->layoutObject() == layoutView &&
       result != LayoutRect(LayoutRect::infiniteIntRect()))
-    result.move(toIntSize(layoutView->frameView()->scrollPosition()));
+    result.move(LayoutSize(layoutView->frameView()->scrollOffset()));
 
   return result;
 }