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

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

Index: third_party/WebKit/Source/core/layout/ng/ng_writing_mode.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_writing_mode.cc b/third_party/WebKit/Source/core/layout/ng/ng_writing_mode.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3056abacf3957f3290145faac4fba50e593792be
--- /dev/null
+++ b/third_party/WebKit/Source/core/layout/ng/ng_writing_mode.cc
@@ -0,0 +1,26 @@
+// 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.
+
+#include "core/layout/ng/ng_writing_mode.h"
+
+#include "platform/text/WritingMode.h"
+#include "wtf/Assertions.h"
+
+namespace blink {
+
+NGWritingMode FromPlatformWritingMode(WritingMode mode) {
+  switch (mode) {
+    case TopToBottomWritingMode:
+      return HorizontalTopBottom;
+    case RightToLeftWritingMode:
+      return VerticalRightLeft;
+    case LeftToRightWritingMode:
+      return VerticalLeftRight;
+    default:
+      NOTREACHED();
+      return HorizontalTopBottom;
+  }
+}
+
+}  // namespace blink