Define DOM_KEY_LOCATION_* constants on KeyboardEvent

Source/core/dom/KeyboardEvent.h

 /*
  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 29 matching lines @@
     unsigned keyLocation;
     bool ctrlKey;
     bool altKey;
     bool shiftKey;
     bool metaKey;
 };
 
 class KeyboardEvent : public UIEventWithKeyState {
 public:
     enum KeyLocationCode {
-        DOMKeyLocationStandard      = 0x00,
-        DOMKeyLocationLeft          = 0x01,
-        DOMKeyLocationRight         = 0x02,
-        DOMKeyLocationNumpad        = 0x03
+        DOM_KEY_LOCATION_STANDARD   = 0x00,
+        DOM_KEY_LOCATION_LEFT       = 0x01,
+        DOM_KEY_LOCATION_RIGHT      = 0x02,
+        DOM_KEY_LOCATION_NUMPAD     = 0x03,
+        // FIXME: The following values are not supported yet (crbug.com/265446)
+        DOM_KEY_LOCATION_MOBILE     = 0x04,

[ojan, 2013/07/29 22:09:07]

I think we should pushback on the spec here. What does "mobile" really mean? Is
a tablet mobile? I can't think of anytime we'd want to set this to true.

+        DOM_KEY_LOCATION_JOYSTICK   = 0x05

[ojan, 2013/07/29 22:09:07]

Same here. They gamepad API is for joysticks. Not sure there's any case we'd
return true here.

I'd rather we only expose these once we actually ever return true for it. Then
developers can feature detect whether the browser would ever return these
values.

     };
 
     static PassRefPtr<KeyboardEvent> create()
     {
         return adoptRef(new KeyboardEvent);
     }
 
     static PassRefPtr<KeyboardEvent> create(const PlatformKeyboardEvent& platformEvent, AbstractView* view)
     {
         return adoptRef(new KeyboardEvent(platformEvent, view));
@@ skipping 60 matching lines @@
 
 inline KeyboardEvent* toKeyboardEvent(Event* event)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!event || event->isKeyboardEvent());
     return static_cast<KeyboardEvent*>(event);
 }
 
 } // namespace WebCore
 
 #endif // KeyboardEvent_h