Use float for scroll offset.

third_party/WebKit/Source/core/layout/LayoutTreeAsText.cpp

 /*
  * Copyright (C) 2004, 2006, 2007 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 580 matching lines @@
   if (layer.isTransparent())
     ts << " transparent";
 
   if (layer.layoutObject()->hasOverflowClip() || reportFrameScrollInfo) {
     ScrollableArea* scrollableArea;
     if (reportFrameScrollInfo)
       scrollableArea = toLayoutView(layer.layoutObject())->frameView();
     else
       scrollableArea = layer.getScrollableArea();
 
-    DoublePoint adjustedScrollOffset =
-        scrollableArea->scrollPositionDouble() +
-        toDoubleSize(scrollableArea->scrollOrigin());
-    if (adjustedScrollOffset.x())
-      ts << " scrollX " << adjustedScrollOffset.x();
-    if (adjustedScrollOffset.y())
-      ts << " scrollY " << adjustedScrollOffset.y();
+    ScrollOffset adjustedScrollOffset =
+        scrollableArea->scrollOffset() +
+        toFloatSize(scrollableArea->scrollOrigin());
+    if (adjustedScrollOffset.width())
+      ts << " scrollX " << adjustedScrollOffset.width();
+    if (adjustedScrollOffset.height())
+      ts << " scrollY " << adjustedScrollOffset.height();
     if (layer.layoutBox() &&
         layer.layoutBox()->pixelSnappedClientWidth() !=
             layer.layoutBox()->pixelSnappedScrollWidth())
       ts << " scrollWidth " << layer.layoutBox()->pixelSnappedScrollWidth();
     if (layer.layoutBox() &&
         layer.layoutBox()->pixelSnappedClientHeight() !=
             layer.layoutBox()->pixelSnappedScrollHeight())
       ts << " scrollHeight " << layer.layoutBox()->pixelSnappedScrollHeight();
   }
 
@@ skipping 257 matching lines @@
   element->document().updateStyleAndLayout();
 
   LayoutObject* layoutObject = element->layoutObject();
   if (!layoutObject || !layoutObject->isListItem())
     return String();
 
   return toLayoutListItem(layoutObject)->markerText();
 }
 
 }  // namespace blink