Add an experimental standalone content suggestions UI.

chrome/android/java/strings/android_chrome_strings.grd

Index: chrome/android/java/strings/android_chrome_strings.grd
diff --git a/chrome/android/java/strings/android_chrome_strings.grd b/chrome/android/java/strings/android_chrome_strings.grd
index 6ddd444bc580e0961e1093179206a7c0c469f92d..f619481a3007ff45a19a7a8ecba28332b7c8b149 100644
--- a/chrome/android/java/strings/android_chrome_strings.grd
+++ b/chrome/android/java/strings/android_chrome_strings.grd
@@ -2877,6 +2877,11 @@ You can control the Physical Web in Chrome Settings.
       <message name="IDS_KEYBOARD_SHORTCUT_WEBPAGE_GROUP_HEADER" desc="A text label that appears above a list of shortcuts that are related to manipulation of the current tab window. This group is part of several groups of keyboard shortcuts all shown in a dialog.">
         Webpage shortcuts
       </message>
+
+      <!-- Content suggestion strings -->
+      <message name="IDS_CONTENT_SUGGESTIONS_STANDALONE_UI" desc="A text label for the menu item to open the content suggestions standalone UI." translateable="false">
+        🔰🆕👌
+      </message>
     </messages>
   </release>
 </grit>