[LayoutNG] Add writing mode to NGDerivedConstraintSpace

third_party/WebKit/Source/core/layout/ng/ng_derived_constraint_space.h

Index: third_party/WebKit/Source/core/layout/ng/ng_derived_constraint_space.h
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_derived_constraint_space.h b/third_party/WebKit/Source/core/layout/ng/ng_derived_constraint_space.h
new file mode 100644
index 0000000000000000000000000000000000000000..44e738344b50a1a96de808010a7872e998d6f619
--- /dev/null
+++ b/third_party/WebKit/Source/core/layout/ng/ng_derived_constraint_space.h
@@ -0,0 +1,44 @@
+// Copyright 2016 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 NGConstraintSpace_h
+#define NGConstraintSpace_h
+
+#include "core/CoreExport.h"
+#include "core/layout/ng/ng_constraint_space.h"
+#include "core/layout/ng/ng_units.h"
+#include "platform/LayoutUnit.h"
+#include "wtf/DoublyLinkedList.h"
+
+namespace blink {
+
+class CORE_EXPORT NGDerivedConstraintSpace final : public NGConstraintSpace {
+ public:
+  ~NGDerivedConstraintSpace();
+
+  LayoutUnit offset() const { return offset_; }
+  LayoutUnit size() const { return size_; }
+
+ private:
+  NGDerivedConstraintSpace(const NGConstraintSpace* original,
+                           NGLogicalOffset offset,
+                           NGLogicalSize size,
+                           NGWritingMode writingMode,
+                           NGDirection direction)
+      : original_(original),
+        offset_(offset),
+        size_(size),
+        writingMode_(writingMode),
+        direction_(direction) {}
+
+  const NGConstraintSpace* original_;
+  NGLogicalOffset offset_;
+  NGLogicalSize size_;
+  NGWritingMode writingMode_;
+  NGDirection direction_;
+};
+
+}  // namespace blink
+
+#endif  // NGConstraintSpace_h