Move spec files back out of spec/javascripts

- Jasmine gem allows us to specify a path to jasmine.yml via ENV

[finish #58126010]

spec/performance/performance_test.js

@@ -0,0 +1,10 @@
+describe("performance", function() {
+  for (var i = 0; i < 10000; i++) {
+    it("should pass", function() {
+      expect(true).toBe(true);
+    });
+    it("should fail", function() {
+      expect(true).toBe(false);
+    });
+  }
+});