Remove assumption that null containerForRepaint assumes RenderView

Source/web/LinkHighlight.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 95 matching lines @@
 }
 
 RenderLayer* LinkHighlight::computeEnclosingCompositingLayer()
 {
     if (!m_node || !m_node->renderer())
         return 0;
 
     // Find the nearest enclosing composited layer and attach to it. We may need to cross frame boundaries
     // to find a suitable layer.
     RenderObject* renderer = m_node->renderer();
-    RenderLayerModelObject* repaintContainer;
+    RenderLayer* renderLayer;
     do {
-        repaintContainer = renderer->containerForRepaint();
-        // FIXME: Repaint container should never be null. crbug.com/363699
-        if (!repaintContainer) {
+        renderLayer = renderer->enclosingLayer()->enclosingCompositingLayerForRepaint();
+        if (!renderLayer) {
             renderer = renderer->frame()->ownerRenderer();
             if (!renderer)
                 return 0;
         }
-    } while (!repaintContainer);
-    RenderLayer* renderLayer = repaintContainer->layer();
-
-    if (!renderLayer || renderLayer->compositingState() == NotComposited)
-        return 0;
+    } while (!renderLayer);
 
     CompositedLayerMappingPtr compositedLayerMapping = renderLayer->compositingState() == PaintsIntoGroupedBacking ? renderLayer->groupedMapping() : renderLayer->compositedLayerMapping();
     GraphicsLayer* newGraphicsLayer = renderLayer->compositingState() == PaintsIntoGroupedBacking ? compositedLayerMapping->squashingLayer() : compositedLayerMapping->mainGraphicsLayer();
 
     m_clipLayer->setTransform(SkMatrix44());
 
     if (!newGraphicsLayer->drawsContent()) {
         if (renderLayer->scrollableArea() && renderLayer->scrollableArea()->usesCompositedScrolling()) {
             ASSERT(renderLayer->hasCompositedLayerMapping() && renderLayer->compositedLayerMapping()->scrollingContentsLayer());
             newGraphicsLayer = compositedLayerMapping->scrollingContentsLayer();
@@ skipping 218 matching lines @@
     // Make sure we update geometry on the next callback from WebViewImpl::layout().
     m_geometryNeedsUpdate = true;
 }
 
 WebLayer* LinkHighlight::layer()
 {
     return clipLayer();
 }
 
 } // namespace WeKit