[KeyboardEvent] Add embedder APIs to translate between Dom |key| enum and strings

ui/events/keycodes/dom/dom_key_data.inc

Index: ui/events/keycodes/dom/dom_key_data.inc
diff --git a/ui/events/keycodes/dom/dom_key_data.inc b/ui/events/keycodes/dom/dom_key_data.inc
index e809b8dd32610f140b2ac0463b73e5bd2b29d401..c5761a49a718c22861994d8f68abdedfb66c62ed 100644
--- a/ui/events/keycodes/dom/dom_key_data.inc
+++ b/ui/events/keycodes/dom/dom_key_data.inc
@@ -28,11 +28,6 @@ DOM_KEY_MAP_DECLARATION {
   //          Key                     Enum
   DOM_KEY_MAP(nullptr,                NONE),  // No value
 
-  // A value of DomKey::CHARACTER indicates that the KeyboardEvent |key|
-  // string is determined by the Unicode character interpretation and is
-  // not one of the fixed string values.
-  DOM_KEY_MAP(nullptr,                CHARACTER),
-
   // =========================================================
   // Special Key Values
   // http://www.w3.org/TR/DOM-Level-3-Events-key/#keys-special
@@ -379,4 +374,9 @@ DOM_KEY_MAP_DECLARATION {
   DOM_KEY_MAP("VideoModeNext",        VIDEO_MODE_NEXT),
   DOM_KEY_MAP("Wink",                 WINK),
   DOM_KEY_MAP("ZoomToggle",           ZOOM_TOGGLE),
+
+  // A value of DomKey::CHARACTER indicates that the KeyboardEvent |key|
+  // string is determined by the Unicode character interpretation and is
+  // not one of the fixed string values.
+  DOM_KEY_MAP(nullptr,                CHARACTER),

[dtapuska, 2015/08/13 13:36:48]

Should a comment be added here that CHARACTER is assumed to be the last item in
the enumeration?

Or should there be a special define for the end of the enumeration that matches
the last most item instead of referring to CHARACTER everywhere?

 };