[LayoutNG] Initial implementation of NGBoxIterator

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

Index: third_party/WebKit/Source/core/layout/ng/ng_block_layout_algorithm.h
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_block_layout_algorithm.h b/third_party/WebKit/Source/core/layout/ng/ng_block_layout_algorithm.h
index 0f92ad1b29a26372479cc7c0bbe29d4435ac6866..54ffa527cac658d8e4e70ebb551709f972f63856 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_block_layout_algorithm.h
+++ b/third_party/WebKit/Source/core/layout/ng/ng_block_layout_algorithm.h
@@ -7,6 +7,7 @@
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/ng_box.h"
+#include "core/layout/ng/ng_box_iterator.h"
 #include "core/layout/ng/ng_layout_algorithm.h"
 #include "wtf/RefPtr.h"
 
@@ -20,7 +21,10 @@ class NGFragment;
 // Lays out the children in sequence.
 class CORE_EXPORT NGBlockLayoutAlgorithm : public NGLayoutAlgorithm {
  public:
-  NGBlockLayoutAlgorithm(PassRefPtr<const ComputedStyle>, NGBox);
+  // Default constructor.
+  // @param style Style reference of the block that is being laid out.
+  // @param boxIterator Iterator for the block's children.
+  NGBlockLayoutAlgorithm(PassRefPtr<const ComputedStyle>, NGBoxIterator);
 
   // Actual layout implementation. Lays out the children in sequence within the
   // constraints given by the NGConstraintSpace. Returns a fragment with the
@@ -31,7 +35,7 @@ class CORE_EXPORT NGBlockLayoutAlgorithm : public NGLayoutAlgorithm {
 
  private:
   RefPtr<const ComputedStyle> m_style;
-  NGBox m_firstChild;
+  NGBoxIterator m_boxIterator;
 };
 
 }  // namespace blink