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

content/browser/renderer_host/web_input_event_aura.cc

Index: content/browser/renderer_host/web_input_event_aura.cc
diff --git a/content/browser/renderer_host/web_input_event_aura.cc b/content/browser/renderer_host/web_input_event_aura.cc
index b09f67e680220fd00d9726e98172ef2b9a523e94..c5b16e6eb60db6b0d24cb5b0d9639362abda4566 100644
--- a/content/browser/renderer_host/web_input_event_aura.cc
+++ b/content/browser/renderer_host/web_input_event_aura.cc
@@ -11,6 +11,7 @@
 #include "ui/events/blink/blink_event_util.h"
 #include "ui/events/event.h"
 #include "ui/events/event_utils.h"
+#include "ui/events/keycodes/dom/dom_key.h"
 #include "ui/events/keycodes/dom/keycode_converter.h"
 
 namespace content {
@@ -85,6 +86,7 @@ blink::WebKeyboardEvent MakeWebKeyboardEventFromAuraEvent(
   webkit_event.nativeKeyCode =
     ui::KeycodeConverter::DomCodeToNativeKeycode(event.code());
   webkit_event.domCode = static_cast<int>(event.code());
+  webkit_event.domKey  = event.GetDomKeyOrCharacter();
   webkit_event.unmodifiedText[0] = event.GetUnmodifiedText();
   webkit_event.text[0] = event.GetText();
 
@@ -276,6 +278,7 @@ blink::WebKeyboardEvent MakeWebKeyboardEvent(const ui::KeyEvent& event) {
     blink::WebKeyboardEvent webkit_event(
         MakeWebKeyboardEventFromNativeEvent(event.native_event()));
     webkit_event.domCode = static_cast<int>(event.code());
+    webkit_event.domKey  = event.GetDomKeyOrCharacter();
     return webkit_event;
   }
 #endif