✅ Deflakes SwG E2E Test (ampproject#25065)

* Adds failinge expectation

* Fixes expectation

* Verify size of btn

* Fixes comment

extensions/amp-subscriptions-google/0.1/test-e2e/test-amp-subscriptions-google.js

@@ -28,10 +28,13 @@ describes.endtoend(
       controller = env.controller;
     });
 
-    // TODO(chenshay): This is failling in Chrome with "ElementNotInteractableError":
-    // https://travis-ci.org/ampproject/amphtml/jobs/598248437#L2053-L2063
-    it.skip('Subscription offers should render correctly', async () => {
+    it('Subscription offers should render correctly', async () => {
       const btn = await controller.findElement('#swg_button');
+      // Wait for button to be rendered and ready to click
+      await expect(controller.getElementRect(btn)).to.include({
+        width: 240,
+        height: 40,
+      });
       await controller.click(btn);
 
       // Switch to SwG's outer iFrame