Bug 1323330 - Part 1: Run test_animation_properties.html with the Web Animation API pref. r=boris

Handling missing keyframe is behind the pref value regardless whether the
script runs on chrome privilege or not. So the pref has to be set explicitly.

MozReview-Commit-ID: 8f83wgGDF4a

--HG--
extra : rebase_source : ac6cfff90680a080194c3c7f92b3636f84cea3b9

dom/animation/test/chrome/test_animation_properties.html

@@ -804,14 +804,21 @@ var gTests = [
   },
 ];
 
-gTests.forEach(function(subtest) {
-  test(function(t) {
-    var div = addDiv(t);
-    var animation = div.animate(subtest.frames, 100 * MS_PER_SEC);
-    assert_properties_equal(animation.effect.getProperties(),
-                            subtest.expected);
-  }, subtest.desc);
-});
+SpecialPowers.pushPrefEnv(
+  { set: [["dom.animations-api.core.enabled", true]] },
+  function() {
+    gTests.forEach(function(subtest) {
+      test(function(t) {
+        var div = addDiv(t);
+        var animation = div.animate(subtest.frames, 100 * MS_PER_SEC);
+        assert_properties_equal(animation.effect.getProperties(),
+                                subtest.expected);
+      }, subtest.desc);
+    });
+
+    done();
+  }
+);
 
 </script>
 </body>