Changed WritingMode to an enum class and renamed its members

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

Index: third_party/WebKit/Source/platform/text/WritingMode.h
diff --git a/third_party/WebKit/Source/platform/text/WritingMode.h b/third_party/WebKit/Source/platform/text/WritingMode.h
index e59527d50d53e7a7523ba98016b5004443469481..b18c46028738a00130d16a654800e58053e0e838 100644
--- a/third_party/WebKit/Source/platform/text/WritingMode.h
+++ b/third_party/WebKit/Source/platform/text/WritingMode.h
@@ -33,26 +33,26 @@
 
 namespace blink {
 
-enum WritingMode {
-  TopToBottomWritingMode,
-  RightToLeftWritingMode,
-  LeftToRightWritingMode
-};
+// These values are named to match the CSS keywords they correspond to: namely
+// horizontal-tb, vertical-rl and vertical-lr.
+// Since these names aren't very self-explanatory, where possible use the
+// inline utility functions below.
+enum class WritingMode : unsigned { HorizontalTb, VerticalRl, VerticalLr };
 
 // Lines have horizontal orientation; modes horizontal-tb.
 inline bool isHorizontalWritingMode(WritingMode writingMode) {
-  return writingMode == TopToBottomWritingMode;
+  return writingMode == WritingMode::HorizontalTb;
 }
 
 // Bottom of the line occurs earlier in the block; modes vertical-lr.
 inline bool isFlippedLinesWritingMode(WritingMode writingMode) {
-  return writingMode == LeftToRightWritingMode;
+  return writingMode == WritingMode::VerticalLr;
 }
 
 // Block progression increases in the opposite direction to normal; modes
 // vertical-rl.
 inline bool isFlippedBlocksWritingMode(WritingMode writingMode) {
-  return writingMode == RightToLeftWritingMode;
+  return writingMode == WritingMode::VerticalRl;
 }
 
 }  // namespace blink