[layoutng] Initial version of block layout

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

+// 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 NGBlockLayoutAlgorithm_h
+#define NGBlockLayoutAlgorithm_h
+
+namespace blink {
+
+class LayoutBox;
+class NGConstraintSpace;
+
+class NGBlockLayoutAlgorithm {
+public:
+    NGBlockLayoutAlgorithm();
+
+    NGConstraintSpace createConstraintSpaceFromLayoutObject(const LayoutBox&);
+};
+
+} // namespace blink
+
+#endif // NGBlockLayoutAlgorithm_h