[LayoutNG] Allow block-flow layout to be fragmented using new approach.

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

Index: third_party/WebKit/Source/core/layout/ng/ng_block_node.h
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_block_node.h b/third_party/WebKit/Source/core/layout/ng/ng_block_node.h
index 1893195b39c12a41ffd61704701348af28355f05..04d2311e1beacf9d607584453f08260a4921c2ef 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_block_node.h
+++ b/third_party/WebKit/Source/core/layout/ng/ng_block_node.h
@@ -34,7 +34,8 @@ class CORE_EXPORT NGBlockNode final : public NGLayoutInputNode {
 
   ~NGBlockNode() override;
 
-  RefPtr<NGLayoutResult> Layout(NGConstraintSpace* constraint_space) override;
+  RefPtr<NGLayoutResult> Layout(NGConstraintSpace* constraint_space,
+                                NGBreakToken* break_token = nullptr) override;
   NGLayoutInputNode* NextSibling() override;
   LayoutObject* GetLayoutObject() override;
 
@@ -53,11 +54,6 @@ class CORE_EXPORT NGBlockNode final : public NGLayoutInputNode {
   void SetNextSibling(NGLayoutInputNode*);
   void SetFirstChild(NGLayoutInputNode*);
 
-  NGBreakToken* CurrentBreakToken() const;
-  bool IsLayoutFinished() const {
-    return layout_result_ && !layout_result_->PhysicalFragment()->BreakToken();
-  }
-
   DECLARE_VIRTUAL_TRACE();
 
   // Runs layout on layout_box_ and creates a fragment for the resulting