Add a chrome://webapks page.

components/webapks_ui/resources/about_webapks.js

Index: components/webapks_ui/resources/about_webapks.js
diff --git a/components/webapks_ui/resources/about_webapks.js b/components/webapks_ui/resources/about_webapks.js
new file mode 100644
index 0000000000000000000000000000000000000000..9fdb7d10c8462bf465b32db49bdd7a402b73521a
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+++ b/components/webapks_ui/resources/about_webapks.js
@@ -0,0 +1,56 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * Creates and returns a node (with |text| as content) assigning it the
+ * |className| class.
+ */
+function createSpanWithTextAndClass(text, className) {
+  var node = createElementWithClassName('span', className);
+  node.textContent = text;
+  return node;
+}
+
+/**
+ * Callback from the backend with the information of a WebAPK to display.
+ * This will be called once for each WebAPK available on the device and each
+ * one will be appended at the end of the other.
+ *
+ * @param webApkList List of objects with information about WebAPKs installed.
+ */
+function returnWebApksInfo(webApkList) {
+  for (const i in webApkList) {
+    addWebApk(webApkList[i]);
+  }
+}
+
+/**
+ * Adds a new entry to the page with the information of a WebAPK.
+ *
+ * @param webApkInfo Information about an installed WebAPK.
+ */
+function addWebApk(webApkInfo) {
+  var webApkList = $('webapk-list');
+
+  webApkList.appendChild(
+      createSpanWithTextAndClass(webApkInfo.shortName, 'app-name'));
+
+  webApkList.appendChild(
+      createSpanWithTextAndClass('Package name: ', 'app-property-label'));
+  webApkList.appendChild(document.createTextNode(webApkInfo.packageName));
+
+  webApkList.appendChild(document.createElement('br'));
+  webApkList.appendChild(createSpanWithTextAndClass(
+      'Shell APK version: ', 'app-property-label'));
+  webApkList.appendChild(document.createTextNode(webApkInfo.shellApkVersion));
+
+  webApkList.appendChild(document.createElement('br'));
+  webApkList.appendChild(
+      createSpanWithTextAndClass('Version code: ', 'app-property-label'));
+  webApkList.appendChild(document.createTextNode(webApkInfo.versionCode));
+}
+
+document.addEventListener('DOMContentLoaded', function() {
+  chrome.send('requestWebApksInfo');
+});