[LayoutNG] Misc fixes in ShapingLineBreaker

third_party/WebKit/Source/platform/fonts/shaping/ShapeResult.cpp

Index: third_party/WebKit/Source/platform/fonts/shaping/ShapeResult.cpp
diff --git a/third_party/WebKit/Source/platform/fonts/shaping/ShapeResult.cpp b/third_party/WebKit/Source/platform/fonts/shaping/ShapeResult.cpp
index bd1254aea0376522dce5fbd9ccdcf9b8c047e93c..963a6c85b7c5e2a1bf99f8b344144628580ce295 100644
--- a/third_party/WebKit/Source/platform/fonts/shaping/ShapeResult.cpp
+++ b/third_party/WebKit/Source/platform/fonts/shaping/ShapeResult.cpp
@@ -183,6 +183,17 @@ size_t ShapeResult::ByteSize() const {
   return self_byte_size;
 }
 
+unsigned ShapeResult::CharacterStartIndex() const {
+  return !Rtl() ? runs_.front()->start_index_ : runs_.back()->start_index_;
+}
+
+unsigned ShapeResult::OffsetForPosition(float target_x,
+                                        OffsetOptions options) const {
+  if (options == kOutsideAsStartOrEnd && target_x <= 0)
+    return Rtl() ? num_characters_ : 0;
+  return OffsetForPosition(target_x, false);
+}
+
 unsigned ShapeResult::OffsetForPosition(float target_x,
                                         bool include_partial_glyphs) const {
   unsigned characters_so_far = 0;