Add new NTP layout with snippet cards and hide it behind a flag

chrome/android/java/strings/android_chrome_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!-- android_chrome_strings.grd contains strings for Chrome for Android.
 
 FAQ:
   - How do I add, change, or remove a string?
       Just update this file.
   - Translations will happen automatically??
       Yes, indeed. Just add your string before the branch point and
       make the description good.
@@ skipping 1812 matching lines @@
       <message name="IDS_RECENTLY_CLOSED" desc="Header for the list of recently closed tabs">
         Recently closed
       </message>
       <message name="IDS_SHOW_FULL_HISTORY" desc="Link text to go to the history page from the recent tabs page.">
         Show full history
       </message>
       <message name="IDS_REMOVE_ALL" desc="Context menu option to clear the list of recently closed tabs">
         Remove all
       </message>
       <message name="IDS_SNIPPETS_HEADER" desc="Header for a group of content snippets">
-        For readers of <ph name="PUBLISHER">%1$s<ex>The New York Times</ex></ph>
-      </message>
-      <message name="IDS_SNIPPETS_NTP_READ_MORE_LINK_TEXT" desc="Link to an article this snippet is describing">
-        Read more
+        Articles for you
       </message>
 
       <!-- Toolbar button strings -->
       <message name="IDS_OPEN_TABS" desc="Text for button to enter the tab switcher and show tabs that are open on this device">
         Open tabs
       </message>
       <message name="IDS_BUTTON_NEW_TAB" desc="Button name for opening a new tab.">
         New tab
       </message>
 
@@ skipping 552 matching lines @@
     <!-- Password Manager strings -->
       <message name="IDS_UPDATE_PASSWORD" desc="A message shown to users to allow updating a saved password for a site, shown in an infobar that appears after the user uses a different password to sign in to the site or uses a password change form.">
         Do you want <ph name="PASSWORD_MANAGER_BRAND">^1<ex>Google Chrome</ex></ph> to update your password for this site?
       </message>
       <message name="IDS_UPDATE_PASSWORD_FOR_ACCOUNT" desc="A message shown to users to allow updating a saved password for a site, where user has multiple credentials saved, shown in an infobar that appears after user uses new password to sign in to the site or uses a password change form.">
         Do you want <ph name="PASSWORD_MANAGER_BRAND">^1<ex>Google Chrome</ex></ph> to update the password for <ph name="USERNAME">^2<ex>don.john.lemon@example.com</ex></ph> for this site?
       </message>
     </messages>
   </release>
 </grit>