Rework compositor touch hit testing

Source/core/rendering/RenderBoxModelObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google 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
@@ skipping 2525 matching lines @@
     if (continuation) {
         if (!continuationMap)
             continuationMap = new ContinuationMap;
         continuationMap->set(this, continuation);
     } else {
         if (continuationMap)
             continuationMap->remove(this);
     }
 }
 
+void RenderBoxModelObject::computeLayerHitTestRects(LayerHitTestRects& rects) const
+{
+    RenderLayerModelObject::computeLayerHitTestRects(rects);
+
+    // If there is a continuation then we need to consult it here, since this is
+    // the root of the tree walk and it wouldn't otherwise get picked up.
+    // Continuations should always be siblings in the tree, so any others should
+    // get picked up already by the tree walk.
+    if (continuation())
+        continuation()->computeLayerHitTestRects(rects);
+}
+
 RenderObject* RenderBoxModelObject::firstLetterRemainingText() const
 {
     if (!firstLetterRemainingTextMap)
         return 0;
     return firstLetterRemainingTextMap->get(this);
 }
 
 void RenderBoxModelObject::setFirstLetterRemainingText(RenderObject* remainingText)
 {
     if (remainingText) {
@@ skipping 186 matching lines @@
     ASSERT(!beforeChild || toBoxModelObject == beforeChild->parent());
     for (RenderObject* child = startChild; child && child != endChild; ) {
         // Save our next sibling as moveChildTo will clear it.
         RenderObject* nextSibling = child->nextSibling();
         moveChildTo(toBoxModelObject, child, beforeChild, fullRemoveInsert);
         child = nextSibling;
     }
 }
 
 } // namespace WebCore