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 5e12996ebb3aab1f6264061cbdb74527904e9d4a..fa6bd890e6843e3ee388f048d95a49442deaa5e9 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayerClipper.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintLayerClipper.cpp
@@ -77,7 +77,7 @@ 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()) ||
@@ -340,7 +340,7 @@ 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;
 }