[LayoutNG] More precise checks for empty inline and add test

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

Index: third_party/WebKit/Source/core/layout/ng/inline/ng_inline_box_state.h
diff --git a/third_party/WebKit/Source/core/layout/ng/inline/ng_inline_box_state.h b/third_party/WebKit/Source/core/layout/ng/inline/ng_inline_box_state.h
index 4e24390b7ceb91c28f41b94596297edde6e95931..cbc48e713252acc00613b2d0171d278c0895d554 100644
--- a/third_party/WebKit/Source/core/layout/ng/inline/ng_inline_box_state.h
+++ b/third_party/WebKit/Source/core/layout/ng/inline/ng_inline_box_state.h
@@ -51,6 +51,7 @@ struct NGInlineBoxState {
   Vector<NGPendingPositions> pending_descendants;
   bool include_used_fonts = false;
   bool needs_box_fragment = false;
+  bool needs_box_fragment_when_empty = false;
 
   // Compute text metrics for a box. All text in a box share the same metrics.
   void ComputeTextMetrics(const ComputedStyle& style, FontBaseline);
@@ -60,9 +61,7 @@ struct NGInlineBoxState {
                            FontBaseline);
 
   // Create a box fragment for this box.
-  void SetNeedsBoxFragment(const NGInlineItem&,
-                           const NGInlineItemResult&,
-                           LayoutUnit position);
+  void SetNeedsBoxFragment(bool when_empty);
   void SetLineRightForBoxFragment(const NGInlineItem&,
                                   const NGInlineItemResult&,
                                   LayoutUnit position);
@@ -82,7 +81,10 @@ class NGInlineLayoutStateStack {
   NGInlineBoxState* OnBeginPlaceItems(const ComputedStyle*, FontBaseline);
 
   // Push a box state stack.
-  NGInlineBoxState* OnOpenTag(const NGInlineItem&, NGLineBoxFragmentBuilder*);
+  NGInlineBoxState* OnOpenTag(const NGInlineItem&,
+                              const NGInlineItemResult&,
+                              NGLineBoxFragmentBuilder*,
+                              LayoutUnit position);
 
   // Pop a box state stack.
   NGInlineBoxState* OnCloseTag(const NGInlineItem&,