[LayoutNG] Implement more text-align values and BiDi base direction

third_party/WebKit/Source/platform/text/TextDirection.h

Index: third_party/WebKit/Source/platform/text/TextDirection.h
diff --git a/third_party/WebKit/Source/platform/text/TextDirection.h b/third_party/WebKit/Source/platform/text/TextDirection.h
index 5d33442be96ad91de36119c70fa37b97d4f55fcb..fa6b7f68837e5602dedb9d5d0dd214955312327e 100644
--- a/third_party/WebKit/Source/platform/text/TextDirection.h
+++ b/third_party/WebKit/Source/platform/text/TextDirection.h
@@ -48,6 +48,10 @@ inline bool IsLtr(TextDirection direction) {
 inline bool IsRtl(TextDirection direction) {
   return direction != TextDirection::kLtr;
 }
+
+inline TextDirection DirectionFromLevel(unsigned level) {
+  return level & 1 ? TextDirection::kRtl : TextDirection::kLtr;
+}
 }
 
 #endif