Resolve ApplyAutoMargins's TODO in NGBlockLayoutAlgorithm.

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

 // 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.
 
 #ifndef NGBlockLayoutAlgorithm_h
 #define NGBlockLayoutAlgorithm_h
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/ng_box.h"
 #include "core/layout/ng/ng_fragment_builder.h"
@@ skipping 48 matching lines @@
                              const NGFragment& fragment);
 
   // Calculates position of the in-flow block-level fragment that needs to be
   // positioned relative to the current fragment that is being built.
   //
   // @param fragment Fragment that needs to be placed.
   // @param child_margins Margins information for the current child fragment.
   // @param space Constraint space for the block.
   // @return Position of the fragment in the parent's constraint space.
   NGLogicalOffset PositionFragment(const NGFragment& fragment,
-                                   NGBoxStrut child_margins,
+                                   const NGBoxStrut& child_margins,
                                    const NGConstraintSpace& space);
 
   // Calculates position of the float fragment that needs to be
   // positioned relative to the current fragment that is being built.
   //
   // @param fragment Fragment that needs to be placed.
   // @param margins Margins information for the fragment.
   // @return Position of the fragment in the parent's constraint space.
   NGLogicalOffset PositionFloatFragment(const NGFragment& fragment,
-                                        NGBoxStrut margins);
+                                        const NGBoxStrut& margins);
 
   // Updates block-{start|end} of the currently constructed fragment.
   //
   // This method is supposed to be called on every child but it only updates
   // the block-start once (on the first non-zero height child fragment) and
   // keeps updating block-end (on every non-zero height child).
   void UpdateMarginStrut(const NGMarginStrut& from);
 
   // Read-only Getters.
   const ComputedStyle& Style() const { return *style_; }
@@ skipping 12 matching lines @@
   // MarginStrut for the previous child.
   NGMarginStrut prev_child_margin_strut_;
   // Whether the block-start was set for the currently built
   // fragment's margin strut.
   bool is_fragment_margin_strut_block_start_updated_ : 1;
 };
 
 }  // namespace blink
 
 #endif  // NGBlockLayoutAlgorithm_h