Use float for scroll offset.

third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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
@@ skipping 951 matching lines @@
   if (!frame()->host()->settings().inertVisualViewport())
     return m_visualViewport->pageX();
 
   FrameView* view = frame()->view();
   if (!view)
     return 0;
 
   document()->updateStyleAndLayoutIgnorePendingStylesheets();
 
   double viewportX =
-      view->layoutViewportScrollableArea()->scrollPositionDouble().x();
+      view->layoutViewportScrollableArea()->scrollOffset().width();
   return adjustScrollForAbsoluteZoom(viewportX, frame()->pageZoomFactor());
 }
 
 double LocalDOMWindow::scrollY() const {
   if (!frame() || !frame()->host())
     return 0;
 
   if (!frame()->host()->settings().inertVisualViewport())
     return m_visualViewport->pageY();
 
   FrameView* view = frame()->view();
   if (!view)
     return 0;
 
   document()->updateStyleAndLayoutIgnorePendingStylesheets();
 
   double viewportY =
-      view->layoutViewportScrollableArea()->scrollPositionDouble().y();
+      view->layoutViewportScrollableArea()->scrollOffset().height();
   return adjustScrollForAbsoluteZoom(viewportY, frame()->pageZoomFactor());
 }
 
 DOMVisualViewport* LocalDOMWindow::visualViewport() {
   if (!frame())
     return nullptr;
 
   return m_visualViewport;
 }
 
@@ skipping 105 matching lines @@
   if (!host)
     return;
 
   x = ScrollableArea::normalizeNonFiniteScroll(x);
   y = ScrollableArea::normalizeNonFiniteScroll(y);
 
   ScrollableArea* viewport = host->settings().inertVisualViewport()
                                  ? view->layoutViewportScrollableArea()
                                  : view->getScrollableArea();
 
-  DoublePoint currentOffset = viewport->scrollPositionDouble();
-  DoubleSize scaledDelta(x * frame()->pageZoomFactor(),
-                         y * frame()->pageZoomFactor());
+  ScrollOffset currentOffset = viewport->scrollOffset();
+  ScrollOffset scaledDelta(x * frame()->pageZoomFactor(),
+                           y * frame()->pageZoomFactor());
 
-  viewport->setScrollPosition(currentOffset + scaledDelta, ProgrammaticScroll,
-                              scrollBehavior);
+  viewport->setScrollOffset(currentOffset + scaledDelta, ProgrammaticScroll,
+                            scrollBehavior);
 }
 
 void LocalDOMWindow::scrollBy(const ScrollToOptions& scrollToOptions) const {
   double x = 0.0;
   double y = 0.0;
   if (scrollToOptions.hasLeft())
     x = scrollToOptions.left();
   if (scrollToOptions.hasTop())
     y = scrollToOptions.top();
   ScrollBehavior scrollBehavior = ScrollBehaviorAuto;
@@ skipping 15 matching lines @@
     return;
 
   x = ScrollableArea::normalizeNonFiniteScroll(x);
   y = ScrollableArea::normalizeNonFiniteScroll(y);
 
   // It is only necessary to have an up-to-date layout if the position may be clamped,
   // which is never the case for (0, 0).
   if (x || y)
     document()->updateStyleAndLayoutIgnorePendingStylesheets();
 
-  DoublePoint layoutPos(x * frame()->pageZoomFactor(),
-                        y * frame()->pageZoomFactor());
+  ScrollOffset layoutOffset(x * frame()->pageZoomFactor(),
+                            y * frame()->pageZoomFactor());
   ScrollableArea* viewport = host->settings().inertVisualViewport()
                                  ? view->layoutViewportScrollableArea()
                                  : view->getScrollableArea();
-  viewport->setScrollPosition(layoutPos, ProgrammaticScroll,
-                              ScrollBehaviorAuto);
+  viewport->setScrollOffset(layoutOffset, ProgrammaticScroll,
+                            ScrollBehaviorAuto);
 }
 
 void LocalDOMWindow::scrollTo(const ScrollToOptions& scrollToOptions) const {
   if (!isCurrentlyDisplayedInFrame())
     return;
 
   FrameView* view = frame()->view();
   if (!view)
     return;
 
   FrameHost* host = frame()->host();
   if (!host)
     return;
 
   // It is only necessary to have an up-to-date layout if the position may be clamped,
   // which is never the case for (0, 0).
   if (!scrollToOptions.hasLeft() || !scrollToOptions.hasTop() ||
       scrollToOptions.left() || scrollToOptions.top()) {
     document()->updateStyleAndLayoutIgnorePendingStylesheets();
   }
 
   double scaledX = 0.0;
   double scaledY = 0.0;
 
   ScrollableArea* viewport = host->settings().inertVisualViewport()
                                  ? view->layoutViewportScrollableArea()
                                  : view->getScrollableArea();
 
-  DoublePoint currentOffset = viewport->scrollPositionDouble();
-  scaledX = currentOffset.x();
-  scaledY = currentOffset.y();
+  ScrollOffset currentOffset = viewport->scrollOffset();
+  scaledX = currentOffset.width();
+  scaledY = currentOffset.height();
 
   if (scrollToOptions.hasLeft())
     scaledX = ScrollableArea::normalizeNonFiniteScroll(scrollToOptions.left()) *
               frame()->pageZoomFactor();
 
   if (scrollToOptions.hasTop())
     scaledY = ScrollableArea::normalizeNonFiniteScroll(scrollToOptions.top()) *
               frame()->pageZoomFactor();
 
   ScrollBehavior scrollBehavior = ScrollBehaviorAuto;
   ScrollableArea::scrollBehaviorFromString(scrollToOptions.behavior(),
                                            scrollBehavior);
 
-  viewport->setScrollPosition(DoublePoint(scaledX, scaledY), ProgrammaticScroll,
-                              scrollBehavior);
+  viewport->setScrollOffset(ScrollOffset(scaledX, scaledY), ProgrammaticScroll,
+                            scrollBehavior);
 }
 
 void LocalDOMWindow::moveBy(int x, int y) const {
   if (!frame() || !frame()->isMainFrame())
     return;
 
   FrameHost* host = frame()->host();
   if (!host)
     return;
 
@@ skipping 324 matching lines @@
 
 LocalFrame* LocalDOMWindow::frame() const {
   // If the LocalDOMWindow still has a frame reference, that frame must point
   // back to this LocalDOMWindow: otherwise, it's easy to get into a situation
   // where script execution leaks between different LocalDOMWindows.
   SECURITY_DCHECK(!m_frame || m_frame->domWindow() == this);
   return m_frame;
 }
 
 }  // namespace blink