Use float for scroll offset.

third_party/WebKit/Source/web/WebLocalFrameImpl.cpp

 /*
  * Copyright (C) 2009 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 587 matching lines @@
 bool WebLocalFrameImpl::isFocused() const {
   if (!viewImpl() || !viewImpl()->page())
     return false;
 
   return this == WebFrame::fromFrame(
                      viewImpl()->page()->focusController().focusedFrame());
 }
 
 WebSize WebLocalFrameImpl::scrollOffset() const {
   if (ScrollableArea* scrollableArea = layoutViewportScrollableArea())
-    return toIntSize(scrollableArea->scrollPosition());
+    return scrollableArea->scrollOffsetInt();
   return WebSize();
 }
 
 void WebLocalFrameImpl::setScrollOffset(const WebSize& offset) {
-  if (ScrollableArea* scrollableArea = layoutViewportScrollableArea())
-    scrollableArea->setScrollPosition(IntPoint(offset.width, offset.height),
-                                      ProgrammaticScroll);
+  if (ScrollableArea* scrollableArea = layoutViewportScrollableArea()) {
+    scrollableArea->setScrollOffset(ScrollOffset(offset.width, offset.height),
+                                    ProgrammaticScroll);
+  }
 }
 
 WebSize WebLocalFrameImpl::contentsSize() const {
   if (FrameView* view = frameView())
     return view->contentsSize();
   return WebSize();
 }
 
 bool WebLocalFrameImpl::hasVisibleContent() const {
   if (LayoutPart* layoutObject = frame()->ownerLayoutObject()) {
@@ skipping 1702 matching lines @@
     feature = UseCounter::ChromeLoadTimesNpnNegotiatedProtocol;
   } else if (metric == "wasAlternateProtocolAvailable") {
     feature = UseCounter::ChromeLoadTimesWasAlternateProtocolAvailable;
   } else if (metric == "connectionInfo") {
     feature = UseCounter::ChromeLoadTimesConnectionInfo;
   }
   UseCounter::count(frame(), feature);
 }
 
 }  // namespace blink