[LayoutNG] Switch NGConstraintSpace to being RefCounted.

third_party/WebKit/Source/core/layout/ng/ng_block_node.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_node.h"
 
 #include "core/layout/LayoutBlockFlow.h"
 #include "core/layout/api/LineLayoutAPIShim.h"
 #include "core/layout/line/InlineIterator.h"
 #include "core/layout/ng/layout_ng_block_flow.h"
@@ skipping 98 matching lines @@
                             MainOrPreferredSize, Length(MinContent),
                             LayoutUnit(), layout_box_->containingBlock()) -
                         borderAndPadding;
     sizes.max_content = layout_box_->computeLogicalWidthUsing(
                             MainOrPreferredSize, Length(MaxContent),
                             LayoutUnit(), layout_box_->containingBlock()) -
                         borderAndPadding;
     return sizes;
   }
 
-  NGConstraintSpace* constraint_space =
+  RefPtr<NGConstraintSpace> constraint_space =
       NGConstraintSpaceBuilder(
           FromPlatformWritingMode(Style().getWritingMode()))
           .SetTextDirection(Style().direction())
           .ToConstraintSpace(FromPlatformWritingMode(Style().getWritingMode()));
 
   // TODO(cbiesinger): For orthogonal children, we need to always synthesize.
-  NGBlockLayoutAlgorithm minmax_algorithm(this, constraint_space);
+  NGBlockLayoutAlgorithm minmax_algorithm(this, constraint_space.get());
   Optional<MinAndMaxContentSizes> maybe_sizes =
       minmax_algorithm.ComputeMinAndMaxContentSizes();
   if (maybe_sizes.has_value())
     return *maybe_sizes;
 
   // Have to synthesize this value.
-  RefPtr<NGLayoutResult> layout_result = Layout(constraint_space);
+  RefPtr<NGLayoutResult> layout_result = Layout(constraint_space.get());
   NGPhysicalFragment* physical_fragment =
       layout_result->PhysicalFragment().get();
   NGBoxFragment min_fragment(FromPlatformWritingMode(Style().getWritingMode()),
                              toNGPhysicalBoxFragment(physical_fragment));
   sizes.min_content = min_fragment.InlineOverflow();
 
   // Now, redo with infinite space for max_content
   constraint_space =
       NGConstraintSpaceBuilder(
           FromPlatformWritingMode(Style().getWritingMode()))
           .SetTextDirection(Style().direction())
           .SetAvailableSize({LayoutUnit::max(), LayoutUnit()})
           .SetPercentageResolutionSize({LayoutUnit(), LayoutUnit()})
           .ToConstraintSpace(FromPlatformWritingMode(Style().getWritingMode()));
 
-  layout_result = Layout(constraint_space);
+  layout_result = Layout(constraint_space.get());
   physical_fragment = layout_result->PhysicalFragment().get();
   NGBoxFragment max_fragment(FromPlatformWritingMode(Style().getWritingMode()),
                              toNGPhysicalBoxFragment(physical_fragment));
   sizes.max_content = max_fragment.InlineOverflow();
   return sizes;
 }
 
 const ComputedStyle& NGBlockNode::Style() const {
   if (style_)
     return *style_.get();
@@ skipping 190 matching lines @@
 // Save static position for legacy AbsPos layout.
 void NGBlockNode::SaveStaticOffsetForLegacy(const NGLogicalOffset& offset) {
   DCHECK(layout_box_);
   DCHECK(layout_box_->isOutOfFlowPositioned());
   DCHECK(layout_box_->layer());
   layout_box_->layer()->setStaticBlockPosition(offset.block_offset);
   layout_box_->layer()->setStaticInlinePosition(offset.inline_offset);
 }
 
 }  // namespace blink