Changed WritingMode to an enum class and renamed its members

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

 /*
  * Copyright (c) 2012, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WritingMode_h
 #define WritingMode_h
 
 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
 
 #endif  // WritingMode_h