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

chrome/browser/resources/settings/search_engines_page/search_engines_browser_proxy.js

Index: chrome/browser/resources/settings/search_engines_page/search_engines_browser_proxy.js
diff --git a/chrome/browser/resources/settings/search_engines_page/search_engines_browser_proxy.js b/chrome/browser/resources/settings/search_engines_page/search_engines_browser_proxy.js
index 7e12c2def5e9b2f8e73d2eeafd4de7a3c74744d8..d1c4d12eea84c807690c12ab8d8a37a0c4f225ae 100644
--- a/chrome/browser/resources/settings/search_engines_page/search_engines_browser_proxy.js
+++ b/chrome/browser/resources/settings/search_engines_page/search_engines_browser_proxy.js
@@ -87,6 +87,9 @@ cr.define('settings', function() {
 
     /** @param {boolean} enabled */
     setHotwordSearchEnabled: function(enabled) {},
+
+    /** @return {!Promise<boolean>} */
+    getGoogleNowAvailability() {},
   };
 
   /**
@@ -146,6 +149,11 @@ cr.define('settings', function() {
     setHotwordSearchEnabled: function(enabled) {
       chrome.send('setHotwordSearchEnabled', [enabled]);
     },
+
+    /** @override */
+    getGoogleNowAvailability: function() {
+      return cr.sendWithPromise('getGoogleNowAvailability');
+    },
   };
 
   return {