Correct visual rects for scroll corner/resizer and non-frame composited scroll bars.

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 2804 matching lines @@
 void PaintLayer::markCompositingContainerChainForNeedsRepaint()
 {
     // 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()) {
+            // TODO(wkorman): As we clean up the CompositedLayerMapping needsRepaint logic to
+            // delegate to scrollbars, we may be able to remove the line below as well.
             groupedMapping->owningLayer().setNeedsRepaint();
             return;
         }
 
         PaintLayer* container = layer->compositingContainer();
         if (!container) {
             LayoutObject* owner = layer->layoutObject()->frame()->ownerLayoutObject();
             if (!owner)
                 break;
             container = owner->enclosingLayer();
@@ skipping 41 matching lines @@
 
 void showLayerTree(const blink::LayoutObject* layoutObject)
 {
     if (!layoutObject) {
         fprintf(stderr, "Cannot showLayerTree. Root is (nil)\n");
         return;
     }
     showLayerTree(layoutObject->enclosingLayer());
 }
 #endif