arc: Restore Chrome badging for apps that have peer in Android apps.

chrome/test/data/extensions/platform_apps/app_icon/test.js

 // Copyright (c) 2013 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.
 
 chrome.app.runtime.onLaunched.addListener(function() {
   chrome.test.sendMessage("Launched");
   // Create a panel window first
   chrome.app.window.create(
     'main.html', { type: "panel" },
     function (win) {
       // Set the panel window icon
       win.setIcon("icon64.png")
       // Create the shell window; it should use the app icon, and not affect
       // the panel icon.
       chrome.app.window.create(
         'main.html', { type: "shell" },
         function (win) {
-          chrome.test.sendMessage("Completed");
+          // Create the shell window which is shown in shelf; it should use
+          // another custom app icon.
+          chrome.app.window.create(
+            'main.html', { id: "win_with_icon",
+                           type: "shell",
+                           icon: "icon48.png",

[msw, 2017/04/06 19:22:29]

q: what's the difference between |win.setIcon("...")" and using this |icon:
"..."| init?

[khmel, 2017/04/06 20:10:40]

It is equivalent, can be used after creation. Also realized that checking
window_icon_url_ is not enough we also should check app_icon_url_. Introduced
HasCustomIcon.

+                           showInShelf: true },
+            function (win) {
+              chrome.test.sendMessage("Completed");
+            });
         });
     });
 });