[LayoutNG] Introduces NGPhysicalConstraintSpace and makes NGConstraintSpace a "view".

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

Index: third_party/WebKit/Source/core/layout/ng/ng_writing_mode.h
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_writing_mode.h b/third_party/WebKit/Source/core/layout/ng/ng_writing_mode.h
new file mode 100644
index 0000000000000000000000000000000000000000..eda01e84ea8e730fd7b7d7be1b879b8bd0f75586
--- /dev/null
+++ b/third_party/WebKit/Source/core/layout/ng/ng_writing_mode.h
@@ -0,0 +1,25 @@
+// 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 NGWritingMode_h
+#define NGWritingMode_h
+
+#include "core/CoreExport.h"
+#include "platform/text/WritingMode.h"
+
+namespace blink {
+
+enum NGWritingMode {
+  HorizontalTopBottom = 0,
+  VerticalRightLeft = 1,
+  VerticalLeftRight = 2,
+  SidewaysRightLeft = 3,
+  SidewaysLeftRight = 4
+};
+
+CORE_EXPORT NGWritingMode FromPlatformWritingMode(WritingMode);
+
+}  // namespace blink
+
+#endif  // NGWritingMode_h