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

content/child/blink_platform_impl.h

Index: content/child/blink_platform_impl.h
diff --git a/content/child/blink_platform_impl.h b/content/child/blink_platform_impl.h
index b1b6e21367b85df889e5a397325593f51450cedf..a7df0621b01d221f6595c619fb638aec78e8b885 100644
--- a/content/child/blink_platform_impl.h
+++ b/content/child/blink_platform_impl.h
@@ -174,7 +174,10 @@ class CONTENT_EXPORT BlinkPlatformImpl
   virtual blink::WebSyncProvider* backgroundSyncProvider();
 
   virtual blink::WebString domCodeStringFromEnum(int dom_code);
-  virtual int domEnumFromCodeString(const blink::WebString& codeString);
+  virtual int domEnumFromCodeString(const blink::WebString& code_string);
+
+  virtual blink::WebString domKeyStringFromEnum(int dom_key);
+  virtual int domKeyEnumFromString(const blink::WebString& key_string);
 
  private:
   void InternalInit();