Migrated several tests from blink to V8 repository.

test/webkit/Object-keys-expected.txt

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-Tests the behavior of Array.prototype.concat while the array is having a bad time due to one of the elements we are concatenating.
+Test to ensure correct behaviour of Object.keys
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
-PASS [42].concat() is [42]
+PASS Object.keys({}) is []
+PASS Object.keys({a:null}) is ['a']
+PASS Object.keys({a:null, b:null}) is ['a', 'b']
+PASS Object.keys({b:null, a:null}) is ['b', 'a']
+PASS Object.keys([]) is []
+PASS Object.keys([null]) is ['0']
+PASS Object.keys([null,null]) is ['0','1']
+PASS Object.keys([null,null,,,,null]) is ['0','1','5']
+PASS Object.keys({__proto__:{a:null}}) is []
+PASS Object.keys({__proto__:[1,2,3]}) is []
+PASS x=[];x.__proto__=[1,2,3];Object.keys(x) is []
 PASS successfullyParsed is true
 
 TEST COMPLETE