[LayoutNG] Add NGLineBoxFragment

third_party/WebKit/Source/core/layout/ng/ng_box_fragment.cc

Index: third_party/WebKit/Source/core/layout/ng/ng_box_fragment.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_box_fragment.cc b/third_party/WebKit/Source/core/layout/ng/ng_box_fragment.cc
index 09855a1a1e66133213b687e55aee5dedb73fb338..405a4cde39bfcee590c3895a7bb73bdb17e22276 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_box_fragment.cc
+++ b/third_party/WebKit/Source/core/layout/ng/ng_box_fragment.cc
@@ -9,6 +9,18 @@
 
 namespace blink {
 
+LayoutUnit NGBoxFragment::InlineOverflow() const {
+  return writing_mode_ == kHorizontalTopBottom
+             ? toNGPhysicalBoxFragment(physical_fragment_)->WidthOverflow()
+             : toNGPhysicalBoxFragment(physical_fragment_)->HeightOverflow();
+}
+
+LayoutUnit NGBoxFragment::BlockOverflow() const {
+  return writing_mode_ == kHorizontalTopBottom
+             ? toNGPhysicalBoxFragment(physical_fragment_)->HeightOverflow()
+             : toNGPhysicalBoxFragment(physical_fragment_)->WidthOverflow();
+}
+
 const WTF::Optional<NGLogicalOffset>& NGBoxFragment::BfcOffset() const {
   WRITING_MODE_IGNORED(
       "Accessing BFC offset is allowed here because writing"