Add a --harmony-object-observe runtime flag (on by default)

test/mjsunit/es6/microtask-delivery.js

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+// Flags: --harmony-object-observe
 // Flags: --allow-natives-syntax
 
 var ordering = [];
 function reset() {
   ordering = [];
 }
 
 function assertArrayValues(expected, actual) {
   assertEquals(expected.length, actual.length);
   for (var i = 0; i < expected.length; i++) {
@@ skipping 121 matching lines @@
 
   p1.resolve();
   ob1.value++;
   p2.resolve();
   ob2.value++;
 
   assertOrdering(['p1', 'o1', 'o2', 'p2', 'o1']);
   assertArrayValues([1, 1], ob1.recordCounts);
   assertArrayValues([1], ob2.recordCounts);
 })();