Use float for scroll offset.

third_party/WebKit/Source/web/WebLocalFrameImpl.cpp

Index: third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp b/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
index 91cd54ae1ec8bff1696e166fe3112d5eb6211eea..4bd3bdce4c842217a659d4a8bbe73cdeedee763e 100644
--- a/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
+++ b/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
@@ -605,14 +605,15 @@ bool WebLocalFrameImpl::isFocused() const {
 
 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 {