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

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

Index: third_party/WebKit/Source/core/layout/ng/ng_physical_constraint_space.h
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_physical_constraint_space.h b/third_party/WebKit/Source/core/layout/ng/ng_physical_constraint_space.h
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index 0000000000000000000000000000000000000000..10b9a37a92afe4016f5816292da7bc768815537b
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+++ b/third_party/WebKit/Source/core/layout/ng/ng_physical_constraint_space.h
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+// 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 NGPhysicalConstraintSpace_h
+#define NGPhysicalConstraintSpace_h
+
+#include "core/CoreExport.h"
+#include "core/layout/ng/ng_units.h"
+#include "platform/heap/Handle.h"
+#include "wtf/DoublyLinkedList.h"
+
+namespace blink {
+
+enum NGExclusionType {
+  NGClearNone = 0,
+  NGClearFloatLeft = 1,
+  NGClearFloatRight = 2,
+  NGClearFragment = 4
+};
+
+enum NGFragmentationType {
+  FragmentNone,
+  FragmentPage,
+  FragmentColumn,
+  FragmentRegion
+};
+
+enum NGDirection { LeftToRight = 0, RightToLeft = 1 };
+
+class NGExclusion {
+ public:
+  NGExclusion();
+  ~NGExclusion() {}
+};
+
+// The NGPhysicalConstraintSpace contains the underlying data for the
+// NGConstraintSpace. It is not meant to be used directly as all members are in
+// the physical coordinate space. Instead NGConstraintSpace should be used.
+class CORE_EXPORT NGPhysicalConstraintSpace final
+    : public GarbageCollected<NGPhysicalConstraintSpace> {
+ public:
+  NGPhysicalConstraintSpace();
+  NGPhysicalConstraintSpace(const NGPhysicalConstraintSpace&);
+
+  void AddExclusion(const NGExclusion, unsigned options = 0);
+  DoublyLinkedList<const NGExclusion> Exclusions(unsigned options = 0) const;
+
+  DEFINE_INLINE_TRACE() {}
+
+ private:
+  friend class NGConstraintSpace;
+
+  NGPhysicalSize container_size_;
+
+  unsigned fixed_width_ : 1;
+  unsigned fixed_height_ : 1;
+  unsigned width_direction_triggers_scrollbar_ : 1;
+  unsigned height_direction_triggers_scrollbar_ : 1;
+  unsigned width_direction_fragmentation_type_ : 2;
+  unsigned height_direction_fragmentation_type_ : 2;
+
+  DoublyLinkedList<const NGExclusion> exclusions_;
+};
+
+}  // namespace blink
+
+#endif  // NGPhysicalConstraintSpace_h