Ship ES6 Math functions.

test/mjsunit/es6/math-trunc.js

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-// Flags: --harmony-maths
-
 assertEquals("Infinity", String(1/Math.trunc(0)));
 assertEquals("-Infinity", String(1/Math.trunc(-0)));
 assertEquals("Infinity", String(1/Math.trunc(Math.PI/4)));
 assertEquals("-Infinity", String(1/Math.trunc(-Math.sqrt(2)/2)));
 assertEquals(100, Math.trunc(100));
 assertEquals(-199, Math.trunc(-199));
 assertEquals(100, Math.trunc(100.1));
 assertTrue(isNaN(Math.trunc("abc")));
 assertTrue(isNaN(Math.trunc({})));
 assertEquals(0, Math.trunc([]));
 assertEquals(1, Math.trunc([1]));
 assertEquals(-100, Math.trunc([-100.1]));
 assertTrue(isNaN(Math.trunc([1, 1])));
 assertEquals(-100, Math.trunc({ toString: function() { return "-100.3"; } }));
 assertEquals(10, Math.trunc({ toString: function() { return 10.1; } }));
 assertEquals(-1, Math.trunc({ valueOf: function() { return -1.1; } }));
 assertEquals("-Infinity",
              String(1/Math.trunc({ valueOf: function() { return "-0.1"; } })));
 assertEquals("-Infinity", String(Math.trunc(-Infinity)));
 assertEquals("Infinity", String(Math.trunc(Infinity)));
 assertEquals("-Infinity", String(Math.trunc("-Infinity")));
 assertEquals("Infinity", String(Math.trunc("Infinity")));