Changes in PaintLayer and PaintLayerPainter for synchronized painting

third_party/WebKit/Source/core/paint/PaintLayer.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 2654 matching lines @@
             }
         } else {
             rect.append(logicalBoundingBox());
             rects.set(this, rect);
         }
     }
 }
 
 void PaintLayer::setNeedsRepaint()
 {
-    PaintLayer* layer = this;
-    while (layer && !layer->isSelfPaintingLayer() && !layer->hasSelfPaintingLayerDescendant())
-        layer = layer->parent();
-
-    // This layer is in an orphaned layer tree. Will mark ancestor for repaint when
-    // the orphaned tree is added into another tree.
-    if (!layer)
-        return;
-
-    layer->m_needsRepaint = true;
+    m_needsRepaint = true;
 
     // Do this unconditionally to ensure container chain is marked when compositing status of the layer changes.
-    layer->markAncestorChainForNeedsRepaint();
+    markAncestorChainForNeedsRepaint();
 }
 
 void PaintLayer::markAncestorChainForNeedsRepaint()
 {
     // Need to access compositingState(). We've ensured correct flag setting when compositingState() changes.
     DisableCompositingQueryAsserts disabler;
 
     PaintLayer* layer = this;
     while (true) {
         if (layer->compositingState() == PaintsIntoOwnBacking)
             return;
         if (CompositedLayerMapping* groupedMapping = layer->groupedMapping()) {
             groupedMapping->owningLayer().setNeedsRepaint();
             return;
         }
 
         PaintLayer* container = layer->parent();
         if (!container) {
             LayoutObject* owner = layer->layoutObject()->frame()->ownerLayoutObject();
             if (!owner)
                 break;
             container = owner->enclosingLayer();
         }
-        if (container->isSelfPaintingLayer() || container->hasSelfPaintingLayerDescendant()) {
-            if (container->m_needsRepaint)
-                break;
-            container->m_needsRepaint = true;
-        }
+        if (container->m_needsRepaint)
+            break;
+        container->m_needsRepaint = true;
         layer = container;
     }
 }
 
 void PaintLayer::clearNeedsRepaintRecursively()
 {
     for (PaintLayer* child = firstChild(); child; child = child->nextSibling())
         child->clearNeedsRepaintRecursively();
     m_needsRepaint = false;
 }
@@ skipping 20 matching lines @@
 
 void showLayerTree(const blink::LayoutObject* layoutObject)
 {
     if (!layoutObject) {
         fprintf(stderr, "Cannot showLayerTree. Root is (nil)\n");
         return;
     }
     showLayerTree(layoutObject->enclosingLayer());
 }
 #endif