1 files changed, 100 insertions, 0 deletions
diff --git a/chromium/third_party/blink/renderer/core/layout/ng/layout_ng_block_flow_mixin.h b/chromium/third_party/blink/renderer/core/layout/ng/layout_ng_block_flow_mixin.h
new file mode 100644
index 00000000000..926c3395f48
--- /dev/null
+++ b/chromium/third_party/blink/renderer/core/layout/ng/layout_ng_block_flow_mixin.h
@@ -0,0 +1,100 @@
+// Copyright 2017 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 THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_LAYOUT_NG_BLOCK_FLOW_MIXIN_H_
+#define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_LAYOUT_NG_BLOCK_FLOW_MIXIN_H_
+
+#include <type_traits>
+
+#include "third_party/blink/renderer/core/core_export.h"
+#include "third_party/blink/renderer/core/layout/layout_block_flow.h"
+#include "third_party/blink/renderer/core/layout/layout_box_model_object.h"
+#include "third_party/blink/renderer/core/layout/layout_table_caption.h"
+#include "third_party/blink/renderer/core/layout/layout_table_cell.h"
+#include "third_party/blink/renderer/core/layout/ng/layout_ng_mixin.h"
+#include "third_party/blink/renderer/core/layout/ng/ng_constraint_space.h"
+
+namespace blink {
+
+enum class NGBaselineAlgorithmType;
+class NGPaintFragment;
+class NGPhysicalFragment;
+struct NGInlineNodeData;
+
+// This mixin holds code shared between LayoutNG subclasses of LayoutBlockFlow.
+template <typename Base>
+class LayoutNGBlockFlowMixin : public LayoutNGMixin<Base> {
+ public:
+  explicit LayoutNGBlockFlowMixin(Element* element);
+  ~LayoutNGBlockFlowMixin() override;
+
+  NGInlineNodeData* TakeNGInlineNodeData() final;
+  NGInlineNodeData* GetNGInlineNodeData() const final;
+  void ResetNGInlineNodeData() final;
+  void ClearNGInlineNodeData() final;
+  bool HasNGInlineNodeData() const final { return ng_inline_node_data_.get(); }
+
+  LayoutUnit FirstLineBoxBaseline() const final;
+  LayoutUnit InlineBlockBaseline(LineDirectionMode) const final;
+
+  void Paint(const PaintInfo&) const final;
+
+  bool NodeAtPoint(HitTestResult&,
+                   const HitTestLocation&,
+                   const PhysicalOffset& accumulated_offset,
+                   HitTestAction) final;
+
+  PositionWithAffinity PositionForPoint(const PhysicalOffset&) const override;
+
+  const NGPaintFragment* PaintFragment() const final {
+    // TODO(layout-dev) crbug.com/963103
+    // Safer option here is to return nullptr only if
+    // Lifecycle > DocumentLifecycle::kAfterPerformLayout, but this breaks
+    // some layout tests.
+    if (Base::NeedsLayout())
+      return nullptr;
+    return paint_fragment_.get();
+  }
+  void SetPaintFragment(const NGBlockBreakToken*,
+                        scoped_refptr<const NGPhysicalFragment>) final;
+
+ protected:
+  void StyleDidChange(StyleDifference, const ComputedStyle* old_style) override;
+
+  const NGPhysicalBoxFragment* CurrentFragment() const final;
+
+  void AddLayoutOverflowFromChildren() final;
+
+  void AddOutlineRects(Vector<PhysicalRect>&,
+                       const PhysicalOffset& additional_offset,
+                       NGOutlineType) const final;
+
+  bool PaintedOutputOfObjectHasNoEffectRegardlessOfSize() const final;
+
+  base::Optional<LayoutUnit> FragmentBaseline(NGBaselineAlgorithmType) const;
+
+  void DirtyLinesFromChangedChild(LayoutObject* child,
+                                  MarkingBehavior marking_behavior) final;
+
+  std::unique_ptr<NGInlineNodeData> ng_inline_node_data_;
+  scoped_refptr<NGPaintFragment> paint_fragment_;
+
+  friend class NGBaseLayoutAlgorithmTest;
+
+ private:
+  void AddScrollingOverflowFromChildren();
+};
+
+// If you edit these export templates, also update templates in
+// layout_ng_mixin.h.
+extern template class CORE_EXTERN_TEMPLATE_EXPORT
+    LayoutNGBlockFlowMixin<LayoutBlockFlow>;
+extern template class CORE_EXTERN_TEMPLATE_EXPORT
+    LayoutNGBlockFlowMixin<LayoutTableCaption>;
+extern template class CORE_EXTERN_TEMPLATE_EXPORT
+    LayoutNGBlockFlowMixin<LayoutTableCell>;
+
+}  // namespace blink
+
+#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_LAYOUT_NG_BLOCK_FLOW_MIXIN_H_