Add position: sticky as supported position value when CSSStickyPosition is enabled.

Source/core/layout/LayoutBlock.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. 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
  * License as published by the Free Software Foundation; either
@@ skipping 357 matching lines @@
                 PaintInvalidationState disabledPaintInvalidationState(childPaintInvalidationState, *this, paintInvalidationContainerForChild);
                 box->invalidateTreeIfNeeded(disabledPaintInvalidationState);
                 continue;
             }
 
             // If the positioned layoutObject is absolutely positioned and it is inside
             // a relatively positioned inline element, we need to account for
             // the inline elements position in PaintInvalidationState.
             if (box->style()->position() == AbsolutePosition) {
                 LayoutObject* container = box->container(&paintInvalidationContainerForChild, 0);
-                if (container->isRelPositioned() && container->isLayoutInline()) {
+                if (container->isInFlowPositioned() && container->isLayoutInline()) {
                     // FIXME: We should be able to use PaintInvalidationState for this.
                     // Currently, we will place absolutely positioned elements inside
                     // relatively positioned inline blocks in the wrong location. crbug.com/371485
                     ForceHorriblySlowRectMapping slowRectMapping(&childPaintInvalidationState);
                     PaintInvalidationState disabledPaintInvalidationState(childPaintInvalidationState, *this, paintInvalidationContainerForChild);
                     box->invalidateTreeIfNeeded(disabledPaintInvalidationState);
                     continue;
                 }
             }
 
@@ skipping 1408 matching lines @@
     return !ancestor || !ancestor->parent() || (ancestor->hasLayer() && ancestor->parent()->isLayoutView())
         || ancestor->nonPseudoNode()->hasEditableStyle() == child->nonPseudoNode()->hasEditableStyle();
 }
 
 // FIXME: This function should go on LayoutObject as an instance method. Then
 // all cases in which positionForPoint recurs could call this instead to
 // prevent crossing editable boundaries. This would require many tests.
 static PositionWithAffinity positionForPointRespectingEditingBoundaries(LayoutBlock* parent, LayoutBox* child, const LayoutPoint& pointInParentCoordinates)
 {
     LayoutPoint childLocation = child->location();
-    if (child->isRelPositioned())
+    if (child->isInFlowPositioned())
         childLocation += child->offsetForInFlowPosition();
 
     // FIXME: This is wrong if the child's writing-mode is different from the parent's.
     LayoutPoint pointInChildCoordinates(toLayoutPoint(pointInParentCoordinates - childLocation));
 
     // If this is an anonymous layoutObject, we just recur normally
     Node* childNode = child->nonPseudoNode();
     if (!childNode)
         return child->positionForPoint(pointInChildCoordinates);
 
@@ skipping 1103 matching lines @@
 void LayoutBlock::showLineTreeAndMark(const InlineBox* markedBox1, const char* markedLabel1, const InlineBox* markedBox2, const char* markedLabel2, const LayoutObject* obj) const
 {
     showLayoutObject();
     for (const RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox())
         root->showLineTreeAndMark(markedBox1, markedLabel1, markedBox2, markedLabel2, obj, 1);
 }
 
 #endif
 
 } // namespace blink