Use float for scroll offset.

third_party/WebKit/Source/core/page/SpatialNavigation.cpp

 /*
  * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Antonio Gomes <tonikitoo@webkit.org>
  *
  * 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
@@ skipping 203 matching lines @@
         dy = -pixelsPerLineStep;
         break;
       case WebFocusTypeDown:
         dy = pixelsPerLineStep;
         break;
       default:
         ASSERT_NOT_REACHED();
         return false;
     }
 
-    frame->view()->scrollBy(IntSize(dx, dy), UserScroll);
+    frame->view()->scrollBy(ScrollOffset(dx, dy), UserScroll);
     return true;
   }
   return false;
 }
 
 bool scrollInDirection(Node* container, WebFocusType type) {
   ASSERT(container);
   if (container->isDocumentNode())
     return scrollInDirection(toDocument(container)->frame(), type);
 
@@ skipping 24 matching lines @@
         ASSERT(container->layoutBox()->scrollHeight() -
                (container->layoutBox()->scrollTop() +
                 container->layoutBox()->clientHeight()));
         dy = pixelsPerLineStep;
         break;
       default:
         ASSERT_NOT_REACHED();
         return false;
     }
 
-    container->layoutBox()->scrollByRecursively(IntSize(dx, dy));
+    container->layoutBox()->scrollByRecursively(ScrollOffset(dx, dy));
     return true;
   }
 
   return false;
 }
 
 static void deflateIfOverlapped(LayoutRect& a, LayoutRect& b) {
   if (!a.intersects(b) || a.contains(b) || b.contains(a))
     return;
 
@@ skipping 80 matching lines @@
   ScrollbarMode verticalMode;
   ScrollbarMode horizontalMode;
   frame->view()->calculateScrollbarModes(horizontalMode, verticalMode);
   if ((type == WebFocusTypeLeft || type == WebFocusTypeRight) &&
       ScrollbarAlwaysOff == horizontalMode)
     return false;
   if ((type == WebFocusTypeUp || type == WebFocusTypeDown) &&
       ScrollbarAlwaysOff == verticalMode)
     return false;
   LayoutSize size(frame->view()->contentsSize());
-  LayoutSize offset(frame->view()->scrollOffset());
+  LayoutSize offset(frame->view()->scrollOffsetInt());
   LayoutRect rect(frame->view()->visibleContentRect(IncludeScrollbars));
 
   switch (type) {
     case WebFocusTypeLeft:
       return offset.width() > 0;
     case WebFocusTypeUp:
       return offset.height() > 0;
     case WebFocusTypeRight:
       return rect.width() + offset.width() < size.width();
     case WebFocusTypeDown:
@@ skipping 11 matching lines @@
     if (!frame->isLocalFrame())
       continue;
     // FIXME: Spatial navigation is broken for OOPI.
     Element* element = frame->deprecatedLocalOwner();
     if (element) {
       do {
         rect.move(element->offsetLeft(), element->offsetTop());
         LayoutObject* layoutObject = element->layoutObject();
         element = layoutObject ? layoutObject->offsetParent() : nullptr;
       } while (element);
-      rect.move((-toLocalFrame(frame)->view()->scrollOffset()));
+      rect.move((-toLocalFrame(frame)->view()->scrollOffsetInt()));
     }
   }
   return rect;
 }
 
 LayoutRect nodeRectInAbsoluteCoordinates(Node* node, bool ignoreBorder) {
   ASSERT(node && node->layoutObject() &&
          !node->document().view()->needsLayout());
 
   if (node->isDocumentNode())
@@ skipping 268 matching lines @@
   return rect;
 }
 
 HTMLFrameOwnerElement* frameOwnerElement(FocusCandidate& candidate) {
   return candidate.isFrameOwnerElement()
              ? toHTMLFrameOwnerElement(candidate.visibleNode)
              : nullptr;
 };
 
 }  // namespace blink