Revert "Remove NonCompositedContentHost" and follow-up rebaselining.

Source/core/rendering/RenderLayer.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 1504 matching lines @@
         // Note: This is only for output rect, so there's no need to expand the dirty source rect.
         rectForRepaint.unite(calculateLayerBounds(this));
     }
     
     RenderLayer* parentLayer = enclosingFilterRepaintLayer();
     ASSERT(parentLayer);
     FloatQuad repaintQuad(rectForRepaint);
     LayoutRect parentLayerRect = renderer()->localToContainerQuad(repaintQuad, parentLayer->renderer()).enclosingBoundingBox();
     
     if (parentLayer->isComposited()) {
-        parentLayer->setBackingNeedsRepaintInRect(parentLayerRect);
-        return;
+        if (!parentLayer->backing()->paintsIntoWindow()) {
+            parentLayer->setBackingNeedsRepaintInRect(parentLayerRect);
+            return;
+        }
+        // If the painting goes to window, redirect the painting to the parent RenderView.
+        parentLayer = renderer()->view()->layer();
+        parentLayerRect = renderer()->localToContainerQuad(repaintQuad, parentLayer->renderer()).enclosingBoundingBox();
     }
 
     if (parentLayer->paintsWithFilters()) {
         parentLayer->setFilterBackendNeedsRepaintingInRect(parentLayerRect);
         return;        
     }
     
     if (parentLayer->isRootLayer()) {
         RenderView* view = toRenderView(parentLayer->renderer());
         view->repaintViewRectangle(parentLayerRect);
@@ skipping 2048 matching lines @@
     return false;
 }
 
 void RenderLayer::paintLayer(GraphicsContext* context, const LayerPaintingInfo& paintingInfo, PaintLayerFlags paintFlags)
 {
     if (isComposited()) {
         // The updatingControlTints() painting pass goes through compositing layers,
         // but we need to ensure that we don't cache clip rects computed with the wrong root in this case.
         if (context->updatingControlTints() || (paintingInfo.paintBehavior & PaintBehaviorFlattenCompositingLayers))
             paintFlags |= PaintLayerTemporaryClipRects;
-        else if (!backing()->paintsIntoCompositedAncestor()
+        else if (!backing()->paintsIntoWindow()
+            && !backing()->paintsIntoCompositedAncestor()
             && !shouldDoSoftwarePaint(this, paintFlags & PaintLayerPaintingReflection)) {
             // If this RenderLayer should paint into its backing, that will be done via RenderLayerBacking::paintIntoLayer().
             return;
         }
     } else if (viewportConstrainedNotCompositedReason() == NotCompositedForBoundsOutOfView) {
         // Don't paint out-of-view viewport constrained layers (when doing prepainting) because they will never be visible
         // unless their position or viewport size is changed.
         return;
     }
 
@@ skipping 1891 matching lines @@
     return m_backing ? m_backing->layerForVerticalScrollbar() : 0;
 }
 
 GraphicsLayer* RenderLayer::layerForScrollCorner() const
 {
     return m_backing ? m_backing->layerForScrollCorner() : 0;
 }
 
 bool RenderLayer::paintsWithTransform(PaintBehavior paintBehavior) const
 {
-    return transform() && ((paintBehavior & PaintBehaviorFlattenCompositingLayers) || !isComposited());
+    bool paintsToWindow = !isComposited() || backing()->paintsIntoWindow();
+    return transform() && ((paintBehavior & PaintBehaviorFlattenCompositingLayers) || paintsToWindow);
 }
 
 bool RenderLayer::backgroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect) const
 {
     if (!isSelfPaintingLayer() && !hasSelfPaintingLayerDescendant())
         return false;
 
     if (paintsWithTransparency(PaintBehaviorNormal))
         return false;
 
@@ skipping 235 matching lines @@
 void RenderLayer::repaintIncludingDescendants()
 {
     renderer()->repaint();
     for (RenderLayer* curr = firstChild(); curr; curr = curr->nextSibling())
         curr->repaintIncludingDescendants();
 }
 
 void RenderLayer::setBackingNeedsRepaint()
 {
     ASSERT(isComposited());
-    backing()->setContentsNeedDisplay();
+    if (backing()->paintsIntoWindow()) {
+        // If we're trying to repaint the placeholder document layer, propagate the
+        // repaint to the native view system.
+        RenderView* view = renderer()->view();
+        if (view)
+            view->repaintViewRectangle(absoluteBoundingBox());
+    } else
+        backing()->setContentsNeedDisplay();
 }
 
 void RenderLayer::setBackingNeedsRepaintInRect(const LayoutRect& r)
 {
     // https://bugs.webkit.org/show_bug.cgi?id=61159 describes an unreproducible crash here,
     // so assert but check that the layer is composited.
     ASSERT(isComposited());
-    if (!isComposited()) {
+    if (!isComposited() || backing()->paintsIntoWindow()) {
         // If we're trying to repaint the placeholder document layer, propagate the
         // repaint to the native view system.
         LayoutRect absRect(r);
         LayoutPoint delta;
         convertToLayerCoords(root(), delta);
         absRect.moveBy(delta);
 
         RenderView* view = renderer()->view();
         if (view)
             view->repaintViewRectangle(absRect);
@@ skipping 660 matching lines @@
     }
 }
 
 void showLayerTree(const WebCore::RenderObject* renderer)
 {
     if (!renderer)
         return;
     showLayerTree(renderer->enclosingLayer());
 }
 #endif