Add custom action support

chrome/browser/resources/chromeos/chromevox/strings/chromevox_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <grit base_dir="." current_release="1" latest_public_release="0"
       output_all_resource_defines="false" enc_check="möl" source_lang_id="en">
   <outputs>
     <output filename="_locales/am/messages.json" type="chrome_messages_json" lang="am"/>
     <output filename="_locales/ar/messages.json" type="chrome_messages_json" lang="ar"/>
     <output filename="_locales/bg/messages.json" type="chrome_messages_json" lang="bg"/>
     <output filename="_locales/bn/messages.json" type="chrome_messages_json" lang="bn"/>
     <output filename="_locales/ca/messages.json" type="chrome_messages_json" lang="ca"/>
@@ skipping 2497 matching lines @@
       </message>
       <message desc="Title displayed in the panel for the speech menu." name="IDS_CHROMEVOX_PANEL_MENU_SPEECH">
         Speech
       </message>
       <message desc="Title displayed in the panel for the tabs menu." name="IDS_CHROMEVOX_PANEL_MENU_TABS">
         Tabs
       </message>
       <message desc="Title displayed in the panel for the ChromeVox menu." name="IDS_CHROMEVOX_PANEL_MENU_CHROMEVOX">
         ChromeVox
       </message>
+      <message desc="Title displayed in the panel for the actions menu." name="IDS_CHROMEVOX_PANEL_MENU_ACTIONS">
+        Actions
+      </message>
       <message desc="Title displayed in the panel when there are no menu items." name="IDS_CHROMEVOX_PANEL_MENU_ITEM_NONE">
         No items.
       </message>
       <message desc="Title displayed in the panel for the menuitem to report an issue." name="IDS_CHROMEVOX_PANEL_MENU_ITEM_REPORT_ISSUE">
         Report an issue
       </message>
       <message desc="Title of a notification that ChromeVox has been updated." name="IDS_CHROMEVOX_UPDATE_TITLE">
         ChromeVox Updated
       </message>
       <message desc="Message text for a notification that ChromeVox has been updated for a new experience." name="IDS_CHROMEVOX_UPDATE_MESSAGE_NEXT">
@@ skipping 240 matching lines @@
       </message>
       <message desc="Spoken when a user navigates to the beginning of strike through text." name="IDS_CHROMEVOX_LINE_THROUGH_START">
         Strike through start
       </message>
       <message desc="Spoken when a user navigates to the end of strike through text." name="IDS_CHROMEVOX_LINE_THROUGH_END">
         Strike through end
       </message>
     </messages>
   </release>
 </grit>