Migrated several tests from blink to V8 repository.

test/webkit/date-daysfrom1970-overflow.js

Index: test/webkit/date-daysfrom1970-overflow.js
diff --git a/test/webkit/concat-while-having-a-bad-time.js b/test/webkit/date-daysfrom1970-overflow.js
similarity index 80%
copy from test/webkit/concat-while-having-a-bad-time.js
copy to test/webkit/date-daysfrom1970-overflow.js
index dfda1e08a0b36194b787a44ee12a9693acd8aeaf..69b40b369ee5f2fe8ffea369542657456803d293 100644
--- a/test/webkit/concat-while-having-a-bad-time.js
+++ b/test/webkit/date-daysfrom1970-overflow.js
@@ -21,11 +21,12 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-description(
-"Tests the behavior of Array.prototype.concat while the array is having a bad time due to one of the elements we are concatenating."
-);
+description('This test confirms an assertion in dateToDaysFrom1970() in wtf/DateMath.cpp passes. The function had a bug setting a number larger than INT_MAX to an int variable.');
 
-Object.defineProperty(Array.prototype, 0, { writable: false });
-shouldBe("[42].concat()", "[42]");
+var d = new Date(20000000, 0, 1);
+shouldBe('d.getTime()', 'NaN');
 
+shouldBe('Date.UTC(1970, 0, 1, 0, 0, 0, 0)', '0');
 
+d = new Date(-20000000, 0, 1);
+shouldBe('d.getTime()', 'NaN');