Fix preferred logical widths of orthogonal writing modes

third_party/WebKit/Source/core/layout/DepthOrderedLayoutObjectList.h

Index: third_party/WebKit/Source/core/layout/DepthOrderedLayoutObjectList.h
diff --git a/third_party/WebKit/Source/core/layout/DepthOrderedLayoutObjectList.h b/third_party/WebKit/Source/core/layout/DepthOrderedLayoutObjectList.h
new file mode 100644
index 0000000000000000000000000000000000000000..596360819a6f786182da1614a48dfeb6adb36fbb
--- /dev/null
+++ b/third_party/WebKit/Source/core/layout/DepthOrderedLayoutObjectList.h
@@ -0,0 +1,60 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef DepthOrderedLayoutObjectList_h
+#define DepthOrderedLayoutObjectList_h
+
+#include "wtf/Allocator.h"
+#include "wtf/HashSet.h"
+#include "wtf/Vector.h"
+
+namespace blink {
+
+class LayoutObject;
+
+class DepthOrderedLayoutObjectList {
+public:
+    DepthOrderedLayoutObjectList()
+    { }
+
+    int size() { return m_roots.size(); }
+    bool isEmpty() const { return m_roots.isEmpty(); }
+
+protected:
+    struct LayoutObjectWithDepth {
+        LayoutObjectWithDepth(LayoutObject* inObject)
+            : object(inObject)
+            , depth(determineDepth(inObject))
+        { }
+
+        LayoutObjectWithDepth()
+            : object(0)
+            , depth(0)
+        { }
+
+        LayoutObject* object;
+        unsigned depth;
+
+        bool operator<(const DepthOrderedLayoutObjectList::LayoutObjectWithDepth& other) const
+        {
+            return depth < other.depth;
+        }
+
+    private:
+        static unsigned determineDepth(LayoutObject*);
+    };
+
+    // Layout roots sorted by depth (shallowest first). This structure is only
+    // populated at the beginning of layout.
+    Vector<LayoutObjectWithDepth> m_orderedRoots;
+
+    // Outside of layout, roots can be added when marked as needing layout and
+    // removed when removed when destroyed. They're kept in this hashset to
+    // keep those operations fast.
+    HashSet<LayoutObject*> m_roots;
+};
+
+} // namespace blink
+
+#endif // DepthOrderedLayoutObjectList_h