Support audio ducking and suspension in ChromeVox

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 456 matching lines @@
       </message>
       <message desc="An option to have an item's context placed at the beginning of its description. For example, reload button, toolbar would become, toolbar, reload button" name="IDS_CHROMEVOX_OPTIONS_OUTPUT_CONTEXT_FIRST">
         Display an item's context before other information (such as its name).
       </message>
       <message desc="An option to enhance the experience of specific sites such as Google Search." name="IDS_CHROMEVOX_OPTIONS_SITE_SPECIFIC_ENHANCEMENTS">
         Enhance specific sites (like Google Search).
       </message>
       <message desc="An option to use more verbose feedback for the user." name="IDS_CHROMEVOX_OPTIONS_VERBOSITY_VERBOSE">
         Enable verbose descriptions.
       </message>
+      <message desc="Describes the multi select option for how to play audio when ChromeVox speaks using text to speech." name="IDS_CHROMEVOX_OPTIONS_AUDIO_DESCRIPTION">
+        When playing audio...
+      </message>
+      <message desc="Sets audio playback to be at normal volume." name="IDS_CHROMEVOX_OPTIONS_AUDIO_NORMAL">
+        Play at normal volume even if ChromeVox is speaking
+      </message>
+      <message desc="An option to use audio ducking." name="IDS_CHROMEVOX_OPTIONS_AUDIO_duck">
+        Play at lower volume when ChromeVox is speaking
+      </message>
+      <message desc="An option to use audio suspension while text to speech is speaking." name="IDS_CHROMEVOX_OPTIONS_AUDIO_suspend">
+        Pause playback when ChromeVox is speaking
+      </message>
       <message desc="An option to show the cursor between characters." name="IDS_CHROMEVOX_OPTIONS_CURSOR_BETWEEN_CHARACTERS">
         Place cursor between characters when editing text (like Mac OS X).
       </message>
       <message desc="An options page section header for options about the ChromeVox voice. This section lets users change the voice by selecting a different voice from a listbox." name="IDS_CHROMEVOX_OPTIONS_VOICES">
         Voices
       </message>
       <message desc="Labels the voice selection list box." name="IDS_CHROMEVOX_OPTIONS_VOICES_DESCRIPTION">
         Change the current voice by selecting an option from the list below.
       </message>
       <message desc="An options page section header for options about the ChromeVox braille support. This section allows the user to customize varous aspects of the braille output and input support." name="IDS_CHROMEVOX_OPTIONS_BRAILLE">
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       </message>
       <message desc="Describes an audio clip that gets played for a specific event or control type. Use the default string as a guide to what the audio clip represents or conveys." name="IDS_CHROMEVOX_SLIDER_EARCON_DESCRIPTION">
         A slider
       </message>
       <message desc="Describes an audio clip that gets played for a specific event or control type. Use the default string as a guide to what the audio clip represents or conveys." name="IDS_CHROMEVOX_WRAP_EARCON_DESCRIPTION">
         Wrap from beginning to end or end to beginning inside of a page, dialog, or other container
       </message>
     </messages>
   </release>
 </grit>