[LayoutNG] Implement LayoutBR/preserved newlines and tabs

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

Index: third_party/WebKit/Source/core/layout/ng/inline/ng_line_breaker.h
diff --git a/third_party/WebKit/Source/core/layout/ng/inline/ng_line_breaker.h b/third_party/WebKit/Source/core/layout/ng/inline/ng_line_breaker.h
index 80293583afa7acd04e8381edbbff66f71f22010b..3823bd947c116cbf03d65554036fb014894a6c99 100644
--- a/third_party/WebKit/Source/core/layout/ng/inline/ng_line_breaker.h
+++ b/third_party/WebKit/Source/core/layout/ng/inline/ng_line_breaker.h
@@ -43,10 +43,15 @@ class CORE_EXPORT NGLineBreaker {
  private:
   void BreakLine(NGInlineItemResults*, NGInlineLayoutAlgorithm*);
 
+  bool HandleControlItem(const NGInlineItem&,
+                         const String& text,
+                         NGInlineItemResult*,
+                         LayoutUnit position);
   void LayoutAtomicInline(const NGInlineItem&, NGInlineItemResult*);
 
   void HandleOverflow(NGInlineItemResults*, const LazyLineBreakIterator&);
 
+  void MoveToNextOf(const NGInlineItem&);
   void SkipCollapsibleWhitespaces();
 
   void AppendCloseTags(NGInlineItemResults*);