[New Multicolumn] Add support for column-span:all

Source/core/rendering/RenderFlowThread.h

 /*
  * Copyright (C) 2011 Adobe Systems Incorporated. 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.
@@ skipping 49 matching lines @@
     virtual bool isRenderFlowThread() const OVERRIDE FINAL { return true; }
     virtual bool isRenderMultiColumnFlowThread() const { return false; }
     virtual bool isRenderPagedFlowThread() const { return false; }
 
     virtual void layout() OVERRIDE;
 
     // Always create a RenderLayer for the RenderFlowThread so that we
     // can easily avoid drawing the children directly.
     virtual LayerType layerTypeRequired() const OVERRIDE FINAL { return NormalLayer; }
 
+    // Some renderers (column spanners) are moved out of the flow thread to live among column

[Julien - ping for review, 2014/09/03 23:22:22]

I would remove |some renderers| and just put |column spanners| directly.

[mstensho (USE GERRIT), 2014/09/04 12:14:02]

Done.

+    // sets. If |child| is such a renderer, resolve it to the placeholder that lives at the original
+    // location in the tree.
+    virtual RenderObject* resolveMovedChild(RenderObject* child) const { return child; }
+    // Called when a descendant of the flow thread has been inserted.

[Julien - ping for review, 2014/09/03 23:22:22]

This comment restates exactly what the name of the function says :-(

[mstensho (USE GERRIT), 2014/09/04 12:14:02]

Done.

+    virtual void flowThreadDescendantInserted(RenderObject*) { }
+    // Called when a sibling or descendant of the flow thread is about to be removed.

[Julien - ping for review, 2014/09/03 23:22:22]

Same comment.

[mstensho (USE GERRIT), 2014/09/04 12:14:02]

Done.

+    virtual void flowThreadRelativeWillBeRemoved(RenderObject*) { }
+
     virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) OVERRIDE FINAL;
 
     virtual void addRegionToThread(RenderMultiColumnSet*) = 0;
     virtual void removeRegionFromThread(RenderMultiColumnSet*);
 
     virtual void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues&) const OVERRIDE;
 
     bool hasRegions() const { return m_multiColumnSetList.size(); }
 
     void validateRegions();
@@ skipping 71 matching lines @@
         RenderMultiColumnSet* endColumnSet() const { return m_endColumnSet; }
 
     private:
         RenderMultiColumnSet* m_startColumnSet;
         RenderMultiColumnSet* m_endColumnSet;
     };
 
     typedef PODInterval<LayoutUnit, RenderMultiColumnSet*> MultiColumnSetInterval;
     typedef PODIntervalTree<LayoutUnit, RenderMultiColumnSet*> MultiColumnSetIntervalTree;
 
-    class RegionSearchAdapter {
+    class MultiColumnSetSearchAdapter {
     public:
-        RegionSearchAdapter(LayoutUnit offset)
+        MultiColumnSetSearchAdapter(LayoutUnit offset)
             : m_offset(offset)
             , m_result(0)
         {
         }
 
         const LayoutUnit& lowValue() const { return m_offset; }
         const LayoutUnit& highValue() const { return m_offset; }
         void collectIfNeeded(const MultiColumnSetInterval&);
 
-        RenderRegion* result() const { return m_result; }
+        RenderMultiColumnSet* result() const { return m_result; }
 
     private:
         LayoutUnit m_offset;
-        RenderRegion* m_result;
+        RenderMultiColumnSet* m_result;
     };
 
     // A maps from RenderBox
     typedef HashMap<const RenderBox*, RenderMultiColumnSetRange> RenderMultiColumnSetRangeMap;
     RenderMultiColumnSetRangeMap m_multiColumnSetRangeMap;
 
     // Stack of objects that pushed a LayoutState object on the RenderView. The
     // objects on the stack are the ones that are curently in the process of being
     // laid out.
     ListHashSet<const RenderObject*> m_statePusherObjectsStack;
@@ skipping 26 matching lines @@
 };
 
 template <> struct ValueToString<RenderMultiColumnSet*> {
     static String string(const RenderMultiColumnSet* value) { return String::format("%p", value); }
 };
 #endif
 
 } // namespace blink
 
 #endif // RenderFlowThread_h