Add experimental Support for DOM3 KeyboardEvent key value

LayoutTests/fast/events/keyboardevent-key-expected.txt

Index: LayoutTests/fast/events/keyboardevent-key-expected.txt
diff --git a/LayoutTests/fast/events/keyboardevent-key-expected.txt b/LayoutTests/fast/events/keyboardevent-key-expected.txt
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index 0000000000000000000000000000000000000000..45d041bfefbf1fd47e0bafb73623bd5e32d33cdd
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+++ b/LayoutTests/fast/events/keyboardevent-key-expected.txt
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+Tests KeyboardEvent.key attribute
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+Modifier Keys
+PASS lastKeyboardUpEvent.key is 'Control'
+PASS lastKeyboardDownEvent.key is 'Control'
+PASS lastKeyboardDownEvent.key is 'Shift'
+PASS lastKeyboardDownEvent.key is 'Shift'
+PASS lastKeyboardDownEvent.key is 'Alt'
+PASS lastKeyboardDownEvent.key is 'AltGraph'
+PASS lastKeyboardDownEvent.key is 'NumLock'
+PASS lastKeyboardUpEvent.key is 'NumLock'
+Whitespace Keys
+PASS lastKeyboardDownEvent.key is 'Enter'
+PASS lastKeyboardDownEvent.key is 'Tab'
+PASS lastKeyboardUpEvent.key is 'Tab'
+Navigation keys
+PASS lastKeyboardDownEvent.key is 'ArrowRight'
+PASS lastKeyboardUpEvent.key is 'ArrowRight'
+PASS lastKeyboardDownEvent.key is 'ArrowDown'
+PASS lastKeyboardDownEvent.key is 'ArrowLeft'
+PASS lastKeyboardDownEvent.key is 'ArrowUp'
+PASS lastKeyboardUpEvent.key is 'ArrowUp'
+PASS lastKeyboardDownEvent.key is 'Home'
+PASS lastKeyboardDownEvent.key is 'End'
+PASS lastKeyboardDownEvent.key is 'PageUp'
+PASS lastKeyboardDownEvent.key is 'PageDown'
+PASS lastKeyboardUpEvent.key is 'PageDown'
+Editing Keys
+PASS lastKeyboardDownEvent.code is 'Backspace'
+PASS lastKeyboardDownEvent.key is 'Insert'
+PASS lastKeyboardUpEvent.key is 'Insert'
+PASS lastKeyboardDownEvent.key is 'Delete'
+Device Keys
+PASS lastKeyboardDownEvent.key is 'PrintScreen'
+PASS lastKeyboardUpEvent.key is 'PrintScreen'
+General Purpose Function Section
+PASS lastKeyboardDownEvent.key is 'F1'
+PASS lastKeyboardDownEvent.key is 'F6'
+PASS lastKeyboardDownEvent.key is 'F12'
+UI Keys
+PASS lastKeyboardDownEvent.key is 'Escape'
+PASS lastKeyboardUpEvent.key is 'Escape'
+PASS lastKeyboardDownEvent.key is 'MediaApps'
+PASS successfullyParsed is true
+
+TEST COMPLETE
+-