[MD settings] display message about secondary install in default browser settings

chrome/browser/resources/settings/default_browser_page/default_browser_browser_proxy.js

+// Copyright 2016 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.
+
+/**
+ * @fileoverview A helper object used from the "Default Browser" section
+ * to interact with the browser.
+ */
+
+/**
+ * @typedef {{
+ *   canBeDefault: boolean,
+ *   isDefault: boolean,
+ *   isDisabledByPolicy: boolean,
+ *   isUnknownError: boolean,
+ * }};
+ */
+var DefaultBrowserInfo;
+
+cr.define('settings', function() {
+  /** @interface */
+  function DefaultBrowserBrowserProxy() {}
+
+  DefaultBrowserBrowserProxy.prototype = {
+    /**
+     * Get the initial DefaultBrowserInfo and begin sending updates to
+     * 'settings.updateDefaultBrowserState'.
+     * @return {!Promise<DefaultBrowserInfo>}
+     */
+    requestDefaultBrowserState: function() {},
+
+    /*
+     * Try to set the current browser as the default browser. The new status of
+     * the settings will be sent to 'settings.updateDefaultBrowserState'.
+     */
+    setAsDefaultBrowser: function() {},
+  };
+
+  /**
+   * @constructor
+   * @implements {settings.DefaultBrowserBrowserProxy}
+   */
+  function DefaultBrowserBrowserProxyImpl() {}
+  cr.addSingletonGetter(DefaultBrowserBrowserProxyImpl);
+
+  DefaultBrowserBrowserProxyImpl.prototype = {
+    /** @override */
+    requestDefaultBrowserState: function() {
+      return cr.sendWithPromise(
+          'SettingsDefaultBrowser.requestDefaultBrowserState');
+    },
+
+    /** @override */
+    setAsDefaultBrowser: function() {
+      chrome.send('SettingsDefaultBrowser.setAsDefaultBrowser');
+    },
+  };
+
+  return {
+    DefaultBrowserBrowserProxy: DefaultBrowserBrowserProxy,
+    DefaultBrowserBrowserProxyImpl: DefaultBrowserBrowserProxyImpl,
+  };
+});