Create OOBE screen for Voice Interaction value proposition

chrome/browser/resources/chromeos/login/oobe_screen_voice_interaction_value_prop.js

+// 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.
+
+/**
+ * @fileoverview Oobe Voice Interaction Value Prop screen implementation.
+ */
+
+login.createScreen('VoiceInteractionValuePropScreen',
+    'voice-interaction-value-prop', function() {
+  return {
+
+    /** @Override */
+    onBeforeShow: function(data) {
+      var valueView = $('voice-interaction-value-prop-md').
+          getElement('value-prop-view');
+
+      valueView.addContentScripts([
+          {
+            name: 'stripLinks',
+            matches: ['<all_urls>'],
+            js: { code:
+              "document.querySelectorAll('a').forEach(" +
+                  "function(anchor){anchor.href='javascript:void(0)';})"
+            },
+            run_at: 'document_end'
+          }]);
+
+      // TODO(updowndota): provide static content later for the final fallback.
+      valueView.request.onHeadersReceived.addListener(function(details) {
+        if (details.statusCode == '404') {
+          if (valueView.src !=
+              'https://www.gstatic.com/opa-chromeos/oobe/en/value_proposition.html') {
+            valueView.src =
+              'https://www.gstatic.com/opa-chromeos/oobe/en/value_proposition.html';
+          }
+        }
+      }, {urls: ['<all_urls>'], types: ['main_frame']});
+
+      var locale = loadTimeData.getString('locale');
+      valueView.src = 'https://www.gstatic.com/opa-chromeos/oobe/' + locale
+          + '/value_proposition.html';
+
+      Oobe.getInstance().headerHidden = true;
+    }
+  };
+});