Cleanup TextDirection

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 62448c7380f133833a273429ff97141ddeb25866..5d33442be96ad91de36119c70fa37b97d4f55fcb 100644
--- a/third_party/WebKit/Source/platform/text/TextDirection.h
+++ b/third_party/WebKit/Source/platform/text/TextDirection.h
@@ -26,13 +26,28 @@
 #ifndef TextDirection_h
 #define TextDirection_h
 
+#include <cstdint>
+
 namespace blink {
 
-enum class TextDirection : unsigned { kRtl, kLtr };
+// The direction of text in bidirectional scripts such as Arabic or Hebrew.
+//
+// Used for explicit directions such as in the HTML dir attribute or the CSS
+// 'direction' property.
+// https://html.spec.whatwg.org/multipage/dom.html#the-dir-attribute
+// https://drafts.csswg.org/css-writing-modes/#direction
+//
+// Also used for resolved directions by UAX#9 UNICODE BIDIRECTIONAL ALGORITHM.
+// http://unicode.org/reports/tr9/
+enum class TextDirection : uint8_t { kLtr = 0, kRtl = 1 };
 
-inline bool IsLeftToRightDirection(TextDirection direction) {
+inline bool IsLtr(TextDirection direction) {
   return direction == TextDirection::kLtr;
 }
+
+inline bool IsRtl(TextDirection direction) {
+  return direction != TextDirection::kLtr;
+}
 }
 
 #endif