MD Settings: Add "Show Google Now cards in the launcher" row in Search section.

chrome/test/data/webui/settings/test_search_engines_browser_proxy.js

Index: chrome/test/data/webui/settings/test_search_engines_browser_proxy.js
diff --git a/chrome/test/data/webui/settings/test_search_engines_browser_proxy.js b/chrome/test/data/webui/settings/test_search_engines_browser_proxy.js
index a42bb95ff89360a8954e5bfe9c77f696c35fbf9b..d1b0b2d2d2d483274e552f29349209ddced97c37 100644
--- a/chrome/test/data/webui/settings/test_search_engines_browser_proxy.js
+++ b/chrome/test/data/webui/settings/test_search_engines_browser_proxy.js
@@ -23,6 +23,7 @@ cr.define('settings_search', function() {
       'validateSearchEngineInput',
       'getHotwordInfo',
       'setHotwordSearchEnabled',
+      'getGoogleNowAvailability',
     ]);
 
     /** @type {boolean} */
@@ -40,6 +41,9 @@ cr.define('settings_search', function() {
       userName: 'user@test.org',
       historyEnabled: false,
     };
+
+    /** @type {boolean} */
+    this.googleNowAvailable = true;
   };
 
   TestSearchEnginesBrowserProxy.prototype = {
@@ -96,6 +100,12 @@ cr.define('settings_search', function() {
       this.methodCalled('setHotwordSearchEnabled');
     },
 
+    /** @override */
+    getGoogleNowAvailability: function() {
+      this.methodCalled('getGoogleNowAvailability');
+      return Promise.resolve(this.googleNowAvailable);
+    },
+
     /**
      * Sets the response to be returned by |getSearchEnginesList|.
      * @param {!SearchEnginesInfo} searchEnginesInfo