Use float for scroll offset.

third_party/WebKit/Source/core/html/ImageDocument.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 Apple 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:
  * 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 280 matching lines @@
 
   if (m_shouldShrinkImage) {
     windowSizeChanged();
   } else {
     restoreImageSize();
 
     updateStyleAndLayout();
 
     double scale = this->scale();
 
-    double scrollX =
-        x / scale - static_cast<double>(frame()->view()->width()) / 2;
-    double scrollY =
-        y / scale - static_cast<double>(frame()->view()->height()) / 2;
+    float scrollX =
+        x / scale - static_cast<float>(frame()->view()->width()) / 2;
+    float scrollY =
+        y / scale - static_cast<float>(frame()->view()->height()) / 2;
 
-    frame()->view()->setScrollPosition(DoublePoint(scrollX, scrollY),
-                                       ProgrammaticScroll);
+    frame()->view()->setScrollOffset(ScrollOffset(scrollX, scrollY),
+                                     ProgrammaticScroll);
   }
 }
 
 void ImageDocument::imageUpdated() {
   DCHECK(m_imageElement);
 
   if (m_imageSizeIsKnown)
     return;
 
   updateStyleAndLayoutTree();
@@ skipping 121 matching lines @@
 }
 
 bool ImageEventListener::operator==(const EventListener& listener) const {
   if (const ImageEventListener* imageEventListener =
           ImageEventListener::cast(&listener))
     return m_doc == imageEventListener->m_doc;
   return false;
 }
 
 }  // namespace blink