Implement backspace state machine for complex emoji sequence.

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

Index: third_party/WebKit/Source/wtf/text/CharacterNames.h
diff --git a/third_party/WebKit/Source/wtf/text/CharacterNames.h b/third_party/WebKit/Source/wtf/text/CharacterNames.h
index 4c5b7d5160ca9e6f1e7d070726e13c8bf45fd0eb..830d0eb1edd84e44b9970bf352a1c22ded8c1bcc 100644
--- a/third_party/WebKit/Source/wtf/text/CharacterNames.h
+++ b/third_party/WebKit/Source/wtf/text/CharacterNames.h
@@ -51,7 +51,13 @@ const UChar combiningEnclosingCircleBackslashCharacter = 0x20E0;
 const UChar combiningEnclosingKeycapCharacter = 0x20E3;
 const UChar ethiopicPrefaceColonCharacter = 0x1366;
 const UChar ethiopicWordspaceCharacter = 0x1361;
+const UChar heavyBlackHeartCharacter = 0x2764;
 const UChar32 eyeCharacter = 0x1F441;
+const UChar32 boyCharacter = 0x1F466;
+const UChar32 girlCharacter = 0x1F467;
+const UChar32 manCharacter = 0x1F468;
+const UChar32 womanCharacter = 0x1F469;
+const UChar32 kissMarkCharacter = 0x1F48B;
 const UChar32 familyCharacter = 0x1F46A;
 const UChar firstStrongIsolateCharacter = 0x2068;
 const UChar fisheyeCharacter = 0x25C9;