[layoutng] Implement support for width: {min,max,fit}-content

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_block_node.h"
 #include "core/layout/ng/ng_layout_algorithm.h"
@@ skipping 18 matching lines @@
   // @param style Style reference of the block that is being laid out.
   // @param first_child Our first child; the algorithm will use its NextSibling
   //                    method to access all the children.
   // @param space The constraint space which the algorithm should generate a
   //              fragment within.
   NGBlockLayoutAlgorithm(PassRefPtr<const ComputedStyle>,
                          NGBlockNode* first_child,
                          NGConstraintSpace* space,
                          NGBreakToken* break_token = nullptr);
 
+  MinAndMaxState ComputeMinAndMaxContentSizes(MinAndMaxContentSizes*) override;
   NGLayoutStatus Layout(NGPhysicalFragmentBase*,
                         NGPhysicalFragmentBase**,
                         NGLayoutAlgorithm**) override;
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   // Creates a new constraint space for the current child.
   NGConstraintSpace* CreateConstraintSpaceForCurrentChild() const;
   void FinishCurrentChildLayout(NGFragmentBase* fragment);
@@ skipping 42 matching lines @@
     DCHECK(current_child_);
     return *current_child_->Style();
   }
 
   const NGConstraintSpace& ConstraintSpace() const {
     return *constraint_space_;
   }
 
   const ComputedStyle& Style() const { return *style_; }
 
-  enum State {
+  enum LayoutState {
     kStateInit,
     kStatePrepareForChildLayout,
     kStateChildLayout,
     kStateFinalize
   };
-  State state_;
+  LayoutState layout_state_;
+  LayoutState compute_minmax_state_;
 
   RefPtr<const ComputedStyle> style_;
 
   Member<NGBlockNode> first_child_;
   Member<NGConstraintSpace> constraint_space_;
   Member<NGBreakToken> break_token_;
   Member<NGFragmentBuilder> builder_;
   Member<NGConstraintSpaceBuilder> space_builder_;
   Member<NGConstraintSpace> space_for_current_child_;
   Member<NGBlockNode> current_child_;
+  Member<NGBlockNode> current_minmax_child_;
+  MinAndMaxContentSizes pending_minmax_sizes_;
 
   NGBoxStrut border_and_padding_;
   LayoutUnit content_size_;
   LayoutUnit max_inline_size_;
   // 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