fix(playbuzz): parent url and host fix (ampproject#13430)

extensions/amp-playbuzz/0.1/amp-playbuzz.js

@@ -42,6 +42,7 @@ import * as events from '../../../src/event-helper';
 import * as utils from './utils';
 import {CSS} from '../../../build/amp-playbuzz-0.1.css.js';
 import {Layout, isLayoutSizeDefined} from '../../../src/layout';
+import {Services} from '../../../src/services';
 import {
   assertAbsoluteHttpOrHttpsUrl,
   parseUrl,
@@ -52,7 +53,6 @@ import {isExperimentOn} from '../../../src/experiments';
 import {logo, showMoreArrow} from './images';
 import {removeElement} from '../../../src/dom';
 import {user} from '../../../src/log';
-
 /** @const */
 const EXPERIMENT = 'amp-playbuzz';
 
@@ -255,15 +255,16 @@ class AmpPlaybuzz extends AMP.BaseElement {
    *
    */
   generateEmbedSourceUrl_() {
-    const winUrl = this.win.location;
+    const canonicalUrl = Services.documentInfoForDoc(this.element).canonicalUrl;
+    const parsedPageUrl = parseUrl(canonicalUrl);
     const params = {
       itemUrl: this.iframeSrcUrl_,
       relativeUrl: parseUrl(this.iframeSrcUrl_).pathname,
       displayItemInfo: this.displayItemInfo_,
       displayShareBar: this.displayShareBar_,
       displayComments: this.displayComments_,
-      parentUrl: removeFragment(winUrl.href),
-      parentHost: winUrl.hostname,
+      parentUrl: removeFragment(parsedPageUrl.href),
+      parentHost: parsedPageUrl.host,
     };
 
     const embedUrl = utils.composeEmbedUrl(params);