Use float for scroll offset.

third_party/WebKit/Source/core/page/Page.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All Rights Reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 442 matching lines @@
     // TODO(rbyers): Most of this doesn't appear to take into account that each
     // SVGImage gets it's own Page instance.
     frameHost().consoleMessageStorage().clear();
     useCounter().didCommitLoad();
     deprecation().clearSuppression();
     frameHost().visualViewport().sendUMAMetrics();
 
     // Need to reset visual viewport position here since before commit load we would update the previous history item,
     // Page::didCommitLoad is called after a new history item is created in FrameLoader.
     // fix for crbug.com/642279
-    frameHost().visualViewport().setScrollPosition(DoublePoint(),
-                                                   ProgrammaticScroll);
+    frameHost().visualViewport().setScrollOffset(ScrollOffset(),
+                                                 ProgrammaticScroll);
     m_hostsUsingFeatures.updateMeasurementsAndClear();
     UserGestureIndicator::clearProcessedUserGestureSinceLoad();
   }
 }
 
 void Page::acceptLanguagesChanged() {
   HeapVector<Member<LocalFrame>> frames;
 
   // Even though we don't fire an event from here, the LocalDOMWindow's will fire
   // an event so we keep the frames alive until we are done.
@@ skipping 62 matching lines @@
     : chromeClient(nullptr),
       contextMenuClient(nullptr),
       editorClient(nullptr),
       spellCheckerClient(nullptr) {}
 
 Page::PageClients::~PageClients() {}
 
 template class CORE_TEMPLATE_EXPORT Supplement<Page>;
 
 }  // namespace blink