[LayoutNG] Introduce NGPositionedFloat.

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

Index: third_party/WebKit/Source/core/layout/ng/ng_block_layout_algorithm.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_block_layout_algorithm.cc b/third_party/WebKit/Source/core/layout/ng/ng_block_layout_algorithm.cc
index 01fe88e8638bfef6854f9fda34b74ddd617f44ac..609a42fd433132607435822d50e66b49ed1e12c3 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_block_layout_algorithm.cc
+++ b/third_party/WebKit/Source/core/layout/ng/ng_block_layout_algorithm.cc
@@ -93,10 +93,9 @@ void PositionPendingFloats(LayoutUnit origin_block_offset,
   DCHECK(container_builder->BfcOffset())
       << "Parent BFC offset should be known here";
   const auto& floating_objects = container_builder->UnpositionedFloats();
-  PositionFloats(origin_block_offset,
-                 container_builder->BfcOffset().value().block_offset,
-                 floating_objects, space);
-  container_builder->MutablePositionedFloats().AppendVector(floating_objects);
+  PositionFloats(
+      origin_block_offset, container_builder->BfcOffset().value().block_offset,
+      floating_objects, &container_builder->MutablePositionedFloats(), space);
   container_builder->MutableUnpositionedFloats().clear();
 }
 
@@ -429,7 +428,8 @@ NGLogicalOffset NGBlockLayoutAlgorithm::PositionNewFc(
           .SetIsNewFormattingContext(false)
           .ToConstraintSpace(child_space.WritingMode());
   PositionFloats(curr_bfc_offset_.block_offset, curr_bfc_offset_.block_offset,
-                 container_builder_.UnpositionedFloats(), tmp_space.Get());
+                 container_builder_.UnpositionedFloats(),
+                 /* positioned_floats */ nullptr, tmp_space.Get());
 
   NGLogicalOffset origin_offset = curr_bfc_offset_;
   origin_offset.inline_offset += border_and_padding_.inline_start;