[LayoutNG] Introduce NGPositionedFloat.

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

 // 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.
 
 #include "core/layout/ng/ng_block_layout_algorithm.h"
 
 #include "core/layout/ng/inline/ng_inline_node.h"
 #include "core/layout/ng/ng_absolute_utils.h"
 #include "core/layout/ng/ng_block_child_iterator.h"
 #include "core/layout/ng/ng_constraint_space.h"
@@ skipping 75 matching lines @@
     builder->SetBfcOffset(mutable_offset);
   }
 }
 
 void PositionPendingFloats(LayoutUnit origin_block_offset,
                            NGFragmentBuilder* container_builder,
                            NGConstraintSpace* space) {
   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);
+  container_builder->MutablePositionedFloats().AppendVector(PositionFloats(
+      origin_block_offset, container_builder->BfcOffset().value().block_offset,
+      floating_objects, space));
   container_builder->MutableUnpositionedFloats().clear();
 }
 
 NGBlockLayoutAlgorithm::NGBlockLayoutAlgorithm(NGBlockNode* node,
                                                NGConstraintSpace* space,
                                                NGBlockBreakToken* break_token)
     : NGLayoutAlgorithm(node, space, break_token),
       space_builder_(constraint_space_) {}
 
 Optional<MinMaxContentSize> NGBlockLayoutAlgorithm::ComputeMinMaxContentSize()
@@ skipping 516 matching lines @@
     if (is_new_bfc) {
       space_available -= child_bfc_offset.block_offset;
     }
   }
   space_builder_.SetFragmentainerSpaceAvailable(space_available);
 
   return space_builder_.ToConstraintSpace(
       FromPlatformWritingMode(child_style.GetWritingMode()));
 }
 }  // namespace blink