Add experimental Support for DOM3 KeyboardEvent key value

public/web/WebInputEvent.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 238 matching lines @@
 
     // The actual key code genenerated by the platform.  The DOM spec runs
     // on Windows-equivalent codes (thus |windowsKeyCode| above) but it
     // doesn't hurt to have this one around.
     int nativeKeyCode;
 
     // The DOM code enum of the key pressed as passed by the embedder. DOM
     // code enum are defined in ui/events/keycodes/dom4/keycode_converter_data.h.
     int domCode;
 
+    // The DOM key enum of the key pressed as passed by the embedder. DOM

[Wez, 2015/05/06 01:32:13]

Suggest "Embedder-specific value identifying the DOM |key| for the event.

+    // key enum are defined in ui/events/keycodes/dom3/dom_key_data.h

[Wez, 2015/05/06 01:32:13]

The path referred to is in Chromium, whereas this is in Blink code, so this (and
the comment on domCode) should be specific that these are Chromium paths, not
Blink.

+    int domKey;
+
     // This identifies whether this event was tagged by the system as being
     // a "system key" event (see
     // http://msdn.microsoft.com/en-us/library/ms646286(VS.85).aspx for
     // details). Other platforms don't have this concept, but it's just
     // easier to leave it always false than ifdef.
     bool isSystemKey;
 
     // |text| is the text generated by this keystroke.  |unmodifiedText| is
     // |text|, but unmodified by an concurrently-held modifiers (except
     // shift).  This is useful for working out shortcut keys.  Linux and
@@ skipping 274 matching lines @@
         , uniqueTouchEventId(0)
     {
     }
 };
 
 #pragma pack(pop)
 
 } // namespace blink
 
 #endif