Add VS15 and VS16 to CharacterNames

Needed for determining emoji presentation options.

BUG=549517

Review URL: https://codereview.chromium.org/1604323002

Cr-Commit-Position: refs/heads/master@{#370709}

third_party/WebKit/Source/wtf/text/CharacterNames.h

@@ -98,6 +98,8 @@ const UChar spaceCharacter = 0x0020;
 const UChar tibetanMarkIntersyllabicTshegCharacter = 0x0F0B;
 const UChar tibetanMarkDelimiterTshegBstarCharacter = 0x0F0C;
 const UChar32 ugariticWordDividerCharacter = 0x1039F;
+const UChar variationSelector15Character = 0xFE0E;
+const UChar variationSelector16Character = 0xFE0F;
 const UChar whiteBulletCharacter = 0x25E6;
 const UChar whiteCircleCharacter = 0x25CB;
 const UChar whiteSesameDotCharacter = 0xFE46;
@@ -174,6 +176,8 @@ using WTF::Unicode::spaceCharacter;
 using WTF::Unicode::tibetanMarkIntersyllabicTshegCharacter;
 using WTF::Unicode::tibetanMarkDelimiterTshegBstarCharacter;
 using WTF::Unicode::ugariticWordDividerCharacter;
+using WTF::Unicode::variationSelector15Character;
+using WTF::Unicode::variationSelector16Character;
 using WTF::Unicode::whiteBulletCharacter;
 using WTF::Unicode::whiteCircleCharacter;
 using WTF::Unicode::whiteSesameDotCharacter;