[LayoutNG] Fix empty inlines to influence the used line height

third_party/WebKit/Source/core/layout/ng/inline/ng_inline_box_state.h

 // Copyright 2017 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 NGInlineBoxState_h
 #define NGInlineBoxState_h
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/inline/ng_line_height_metrics.h"
 #include "core/style/ComputedStyleConstants.h"
@@ skipping 22 matching lines @@
 struct NGInlineBoxState {
   unsigned fragment_start;
   const ComputedStyle* style;
   NGLineHeightMetrics metrics;
   NGLineHeightMetrics text_metrics;
   LayoutUnit text_top;
   Vector<NGPendingPositions> pending_descendants;
   bool include_used_fonts = false;
 
   // Compute text metrics for a box. All text in a box share the same metrics.
-  void ComputeTextMetrics(const NGInlineItem&, FontBaseline);
+  void ComputeTextMetrics(const ComputedStyle& style, FontBaseline);
+  void AccumulateUsedFonts(const NGInlineItem&,
+                           unsigned start,
+                           unsigned end,
+                           FontBaseline);
 };
 
 // Represents the inline tree structure. This class provides:
 // 1) Allow access to fragments belonging to the current box.
 // 2) Performs layout when the positin/size of a box was computed.
 // 3) Cache common values for a box.
 class NGInlineLayoutStateStack {
  public:
+  // The box state for the line box.
+  NGInlineBoxState& LineBoxState() { return stack_.front(); }
+
   // Initialize the box state stack for a new line.
   // @return The initial box state for the line.
-  NGInlineBoxState* OnBeginPlaceItems(const ComputedStyle*);
+  NGInlineBoxState* OnBeginPlaceItems(const ComputedStyle*, FontBaseline);
 
   // Push a box state stack.
   NGInlineBoxState* OnOpenTag(const NGInlineItem&,
                               NGLineBoxFragmentBuilder*,
                               NGTextFragmentBuilder*);
 
   // Pop a box state stack.
   NGInlineBoxState* OnCloseTag(const NGInlineItem&,
                                NGLineBoxFragmentBuilder*,
                                NGInlineBoxState*);
@@ skipping 13 matching lines @@
   // https://www.w3.org/TR/CSS22/visudet.html#propdef-vertical-align
   // https://www.w3.org/TR/css-inline-3/#propdef-vertical-align
   void ApplyBaselineShift(NGInlineBoxState*, NGLineBoxFragmentBuilder*);
 
   Vector<NGInlineBoxState, 4> stack_;
 };
 
 }  // namespace blink
 
 #endif  // NGInlineBoxState_h