Add shouldBeNow() to js-tests.js in LayoutTests.

LayoutTests/fast/harness/should-be-now-expected.txt

Index: LayoutTests/fast/harness/should-be-now-expected.txt
diff --git a/LayoutTests/fast/harness/should-be-now-expected.txt b/LayoutTests/fast/harness/should-be-now-expected.txt
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+Test shouldBeNow() in js-test.js
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS Date.now() is equivalent to Date.now().
+PASS new Date() is equivalent to Date.now().
+Testing type checking with a string. This should fail.
+FAIL 'Hello world!' is not a number or a Date. Got Hello world!
+Testing past dates. This should fail.
+FAIL 50000 is not the curent time. Got 50000 which is 10 seconds in the past.
+Testing future dates. This should fail.
+FAIL 70000 is not the current time. Got 70000 which is 10 seconds in the future.
+Simulating a defective clock that always goes backwards. The test below should fail.
+FAIL new Date() cannot be tested against the current time. The clock is going backwards too often.
+PASS successfullyParsed is true
+
+TEST COMPLETE
+