Handle both plural and singular tab switcher content descriptions.

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 2194 matching lines @@
       </message>
       <message name="IDS_ACCESSIBILITY_NEW_INCOGNITO_TAB_PAGE" desc="Accessibility text to read aloud when the user focuses the new incognito tab view.">
         New incognito tab
       </message>
       <message name="IDS_ACCESSIBILITY_TOOLBAR_BTN_NEW_TAB" desc="Content description for the new tab button.">
         New tab
       </message>
       <message name="IDS_ACCESSIBILITY_TOOLBAR_BTN_NEW_INCOGNITO_TAB" desc="Content description for the new incognito tab button.">
         New incognito tab
       </message>
-      <message name="IDS_ACCESSIBILITY_TOOLBAR_BTN_TABSWITCHER_TOGGLE" desc="Content description for the button that enters or leaves the tab switcher.">
-        <ph name="OPEN_TABS">%1$d<ex>3</ex></ph> open tabs
+      <message name="IDS_ACCESSIBILITY_TOOLBAR_BTN_TABSWITCHER_TOGGLE" desc="Content description for the button that enters or leaves the tab switcher. [ICU Syntax]">
+        {OPEN_TABS, plural, =1 {%1$d open tab} other {%1$d open tabs}}
+      </message>
+      <message name="IDS_ACCESSIBILITY_TOOLBAR_BTN_TABSWITCHER_TOGGLE_DEFAULT" desc="Placeholder content description for the button that enters or leaves the tab switcher.">
+        open tabs
       </message>
       <message name="IDS_ACCESSIBILITY_TOOLBAR_BTN_HOME" desc="Content description for the home button.">
         Home
       </message>
       <message name="IDS_ACCESSIBILITY_BTN_REFRESH" desc="Content description for the refresh page button.">
         Refresh page
       </message>
       <message name="IDS_ACCESSIBILITY_BTN_STOP_LOADING" desc="Content description for the stop loading page button.">
         Stop page loading
       </message>
@@ skipping 342 matching lines @@
         Tap this button for quick access to your tabs.
       </message>
 
       <!-- Item Chooser UI strings -->
       <message name="IDS_ITEM_CHOOSER_ITEM_NAME_WITH_ID" desc="To distinguish items with the same name, the item chooser shows the item name with id.">
         <ph name="ITEM_NAME">%1$s<ex>item_name</ex></ph> (<ph name="ITEM_ID">%2$s<ex>item id</ex></ph>)
       </message>
     </messages>
   </release>
 </grit>