Convert Settings::rootLayerScrolls to RuntimeEnabledFeatures

third_party/WebKit/Source/core/layout/LayoutView.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * 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,
@@ skipping 186 matching lines @@
 }
 #endif
 
 void LayoutView::setShouldDoFullPaintInvalidationOnResizeIfNeeded()
 {
     // When background-attachment is 'fixed', we treat the viewport (instead of the 'root'
     // i.e. html or body) as the background positioning area, and we should fully invalidate
     // on viewport resize if the background image is not composited and needs full paint
     // invalidation on background positioning area resize.
     if (style()->hasFixedBackgroundImage() && (!m_compositor || !m_compositor->needsFixedRootBackgroundLayer(layer()))) {
-        IncludeScrollbarsInRect includeScrollbars = document().settings() && document().settings()->rootLayerScrolls() ? IncludeScrollbars : ExcludeScrollbars;
+        IncludeScrollbarsInRect includeScrollbars = RuntimeEnabledFeatures::rootLayerScrollingEnabled() ? IncludeScrollbars : ExcludeScrollbars;
         if ((offsetWidth() != viewWidth(includeScrollbars) && mustInvalidateFillLayersPaintOnWidthChange(style()->backgroundLayers()))
             || (offsetHeight() != viewHeight(includeScrollbars) && mustInvalidateFillLayersPaintOnHeightChange(style()->backgroundLayers())))
             setShouldDoFullPaintInvalidation(PaintInvalidationBoundsChange);
     }
 }
 
 void LayoutView::layout()
 {
     if (!document().paginated())
         setPageLogicalHeight(LayoutUnit());
@@ skipping 56 matching lines @@
 #if ENABLE(ASSERT)
     checkLayoutState();
 #endif
     clearNeedsLayout();
 }
 
 LayoutRect LayoutView::visualOverflowRect() const
 {
     // In root layer scrolling mode, the LayoutView performs overflow clipping
     // like a regular scrollable div.
-    if (document().settings() && document().settings()->rootLayerScrolls())
+    if (RuntimeEnabledFeatures::rootLayerScrollingEnabled())
         return LayoutBlockFlow::visualOverflowRect();
 
     // Ditto when not in compositing mode.
     if (!usesCompositing())
         return LayoutBlockFlow::visualOverflowRect();
 
     // In normal compositing mode, LayoutView doesn't actually apply clipping
     // on its descendants. Instead their visual overflow is propagated to
     // compositor()->m_rootContentLayer for accelerated scrolling.
     return LayoutRect(documentRect());
@@ skipping 555 matching lines @@
     return style()->isHorizontalWritingMode() ? viewWidth(scrollbarInclusion) : viewHeight(scrollbarInclusion);
 }
 
 int LayoutView::viewLogicalHeight(IncludeScrollbarsInRect scrollbarInclusion) const
 {
     return style()->isHorizontalWritingMode() ? viewHeight(scrollbarInclusion) : viewWidth(scrollbarInclusion);
 }
 
 int LayoutView::viewLogicalWidthForBoxSizing() const
 {
-    return viewLogicalWidth(document().settings() && document().settings()->rootLayerScrolls() ? IncludeScrollbars : ExcludeScrollbars);
+    return viewLogicalWidth(RuntimeEnabledFeatures::rootLayerScrollingEnabled() ? IncludeScrollbars : ExcludeScrollbars);
 }
 
 int LayoutView::viewLogicalHeightForBoxSizing() const
 {
-    return viewLogicalHeight(document().settings() && document().settings()->rootLayerScrolls() ? IncludeScrollbars : ExcludeScrollbars);
+    return viewLogicalHeight(RuntimeEnabledFeatures::rootLayerScrollingEnabled() ? IncludeScrollbars : ExcludeScrollbars);
 }
 
 LayoutUnit LayoutView::viewLogicalHeightForPercentages() const
 {
     if (shouldUsePrintingLayout())
         return pageLogicalHeight();
     return LayoutUnit(viewLogicalHeight());
 }
 
 float LayoutView::zoomFactor() const
@@ skipping 94 matching lines @@
 {
     LayoutBlockFlow::updateFromStyle();
 
     // LayoutView of the main frame is responsible for painting base background.
     if (document().isInMainFrame())
         setHasBoxDecorationBackground(true);
 }
 
 bool LayoutView::allowsOverflowClip() const
 {
-    return document().settings() && document().settings()->rootLayerScrolls();
+    return RuntimeEnabledFeatures::rootLayerScrollingEnabled();
 }
 
 ScrollResult LayoutView::scroll(ScrollGranularity granularity, const FloatSize& delta)
 {
     // TODO(bokan): We shouldn't need this specialization but we currently do
     // because of the Windows pan scrolling path. That should go through a more
     // normalized ScrollManager-like scrolling path and we should get rid of
     // of this override. All frame scrolling should be handled by
     // ViewportScrollCallback.
 
     if (!frameView())
         return ScrollResult(false, false, delta.width(), delta.height());
 
     return frameView()->getScrollableArea()->userScroll(granularity, delta);
 }
 
 } // namespace blink