Add experimental Support for DOM3 KeyboardEvent key value

Source/core/inspector/InspectorInputAgent.h

 /*
  * Copyright (C) 2012 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 36 matching lines @@
 public:
     static PassOwnPtrWillBeRawPtr<InspectorInputAgent> create(InspectorPageAgent* pageAgent, InspectorClient* client)
     {
         return adoptPtrWillBeNoop(new InspectorInputAgent(pageAgent, client));
     }
 
     virtual ~InspectorInputAgent();
     virtual void trace(Visitor*) override;
 
     // Methods called from the frontend for simulating input.
-    virtual void dispatchKeyEvent(ErrorString*, const String& type, const int* modifiers, const double* timestamp, const String* text, const String* unmodifiedText, const String* keyIdentifier, const String* code, const int* windowsVirtualKeyCode, const int* nativeVirtualKeyCode, const bool* autoRepeat, const bool* isKeypad, const bool* isSystemKey) override;
+    virtual void dispatchKeyEvent(ErrorString*, const String& type, const int* modifiers, const double* timestamp, const String* text, const String* unmodifiedText, const String* keyIdentifier, const String* code, const String* key, const int* windowsVirtualKeyCode, const int* nativeVirtualKeyCode, const bool* autoRepeat, const bool* isKeypad, const bool* isSystemKey) override;
     virtual void dispatchMouseEvent(ErrorString*, const String& type, int x, int y, const int* modifiers, const double* timestamp, const String* button, const int* clickCount) override;
     virtual void dispatchTouchEvent(ErrorString*, const String& type, const RefPtr<JSONArray>& touchPoints, const int* modifiers, const double* timestamp) override;
 private:
     InspectorInputAgent(InspectorPageAgent*, InspectorClient*);
 
     RawPtrWillBeMember<InspectorPageAgent> m_pageAgent;
     InspectorClient* m_client;
 };
 
 
 } // namespace blink
 
 #endif // !defined(InspectorInputAgent_h)