Polyfill promise into 3p iframe integration.js (ampproject#29532)

Author: powerivq

3p/polyfills.js

@@ -22,9 +22,11 @@
 import {install as installMathSign} from '../src/polyfills/math-sign';
 import {install as installObjectAssign} from '../src/polyfills/object-assign';
 import {install as installObjectValues} from '../src/polyfills/object-values';
+import {install as installPromise} from '../src/polyfills/promise';
 
 if (!IS_ESM) {
   installMathSign(self);
   installObjectAssign(self);
   installObjectValues(self);
+  installPromise(self);
 }

build-system/test-configs/dep-check-config.js

@@ -117,6 +117,7 @@ exports.rules = [
       '3p/polyfills.js->src/polyfills/math-sign.js',
       '3p/polyfills.js->src/polyfills/object-assign.js',
       '3p/polyfills.js->src/polyfills/object-values.js',
+      '3p/polyfills.js->src/polyfills/promise.js',
       '3p/messaging.js->src/event-helper.js',
       '3p/bodymovinanimation.js->src/event-helper.js',
       '3p/iframe-messaging-client.js->src/event-helper.js',
@@ -417,6 +418,7 @@ exports.rules = [
       '3p/polyfills.js->src/polyfills/math-sign.js',
       '3p/polyfills.js->src/polyfills/object-assign.js',
       '3p/polyfills.js->src/polyfills/object-values.js',
+      '3p/polyfills.js->src/polyfills/promise.js',
       'src/polyfills.js->src/polyfills/domtokenlist.js',
       'src/polyfills.js->src/polyfills/document-contains.js',
       'src/polyfills.js->src/polyfills/fetch.js',