Adding support for DOM3 KeyboardEvents Code in KeyboardEvents

Source/platform/PlatformKeyboardEvent.h

Index: Source/platform/PlatformKeyboardEvent.h
diff --git a/Source/platform/PlatformKeyboardEvent.h b/Source/platform/PlatformKeyboardEvent.h
index a67cc216c84893b9f4c62c5612f8b686a0ea1c10..0231075dfdf9a9abd06aa4b18f6b76bbc827630e 100644
--- a/Source/platform/PlatformKeyboardEvent.h
+++ b/Source/platform/PlatformKeyboardEvent.h
@@ -46,11 +46,12 @@ public:
     {
     }
 
-    PlatformKeyboardEvent(Type type, const String& text, const String& unmodifiedText, const String& keyIdentifier, int windowsVirtualKeyCode, int nativeVirtualKeyCode, bool isAutoRepeat, bool isKeypad, bool isSystemKey, Modifiers modifiers, double timestamp)
+    PlatformKeyboardEvent(Type type, const String& text, const String& unmodifiedText, const String& keyIdentifier, const String& code, int windowsVirtualKeyCode, int nativeVirtualKeyCode, bool isAutoRepeat, bool isKeypad, bool isSystemKey, Modifiers modifiers, double timestamp)
         : PlatformEvent(type, modifiers, timestamp)
         , m_text(text)
         , m_unmodifiedText(unmodifiedText)
         , m_keyIdentifier(keyIdentifier)
+        , m_code(code)
         , m_windowsVirtualKeyCode(windowsVirtualKeyCode)
         , m_nativeVirtualKeyCode(nativeVirtualKeyCode)
         , m_autoRepeat(isAutoRepeat)
@@ -76,6 +77,8 @@ public:
 
     String keyIdentifier() const { return m_keyIdentifier; }
 
+    String code() const { return m_code; }
+
     // Most compatible Windows virtual key code associated with the event.
     // Zero for Char events.
     int windowsVirtualKeyCode() const { return m_windowsVirtualKeyCode; }
@@ -93,6 +96,7 @@ protected:
     String m_text;
     String m_unmodifiedText;
     String m_keyIdentifier;
+    String m_code;
     int m_windowsVirtualKeyCode;
     int m_nativeVirtualKeyCode;
     bool m_autoRepeat;