Use float for scroll offset.

third_party/WebKit/Source/web/WebHistoryItem.cpp

Index: third_party/WebKit/Source/web/WebHistoryItem.cpp
diff --git a/third_party/WebKit/Source/web/WebHistoryItem.cpp b/third_party/WebKit/Source/web/WebHistoryItem.cpp
index 0a4c4024f7f84492d6e5bfdd51cd37d57b6a2d4c..5286ac4785d7b942ca73f5490c6099bc675ec51a 100644
--- a/third_party/WebKit/Source/web/WebHistoryItem.cpp
+++ b/third_party/WebKit/Source/web/WebHistoryItem.cpp
@@ -87,20 +87,22 @@ void WebHistoryItem::setTarget(const WebString& target) {
 }
 
 WebFloatPoint WebHistoryItem::visualViewportScrollOffset() const {
-  return m_private->visualViewportScrollPoint();
+  ScrollOffset offset = m_private->visualViewportScrollOffset();
+  return WebFloatPoint(offset.width(), offset.height());
 }
 
 void WebHistoryItem::setVisualViewportScrollOffset(
     const WebFloatPoint& scrollOffset) {
-  m_private->setVisualViewportScrollPoint(scrollOffset);
+  m_private->setVisualViewportScrollOffset(toScrollOffset(scrollOffset));
 }
 
 WebPoint WebHistoryItem::scrollOffset() const {
-  return m_private->scrollPoint();
+  ScrollOffset offset = m_private->scrollOffset();
+  return WebPoint(offset.width(), offset.height());
 }
 
 void WebHistoryItem::setScrollOffset(const WebPoint& scrollOffset) {
-  m_private->setScrollPoint(scrollOffset);
+  m_private->setScrollOffset(ScrollOffset(scrollOffset.x, scrollOffset.y));
 }
 
 float WebHistoryItem::pageScaleFactor() const {