Support audio ducking and suspension in ChromeVox

chrome/browser/resources/chromeos/chromevox/chromevox/background/options.html

Index: chrome/browser/resources/chromeos/chromevox/chromevox/background/options.html
diff --git a/chrome/browser/resources/chromeos/chromevox/chromevox/background/options.html b/chrome/browser/resources/chromeos/chromevox/chromevox/background/options.html
index 2ab391f24b7fb84416047ba0c5e7ec3c3c69cef2..1a50e1e2458779ddb26eeafe14588b8f1ef641bf 100644
--- a/chrome/browser/resources/chromeos/chromevox/chromevox/background/options.html
+++ b/chrome/browser/resources/chromeos/chromevox/chromevox/background/options.html
@@ -34,6 +34,20 @@
     </label>
   </div>
 
+  <div class="option">
+    <input id="useAudioDucking" type="checkbox" class="checkbox pref" name="useAudioDucking" />
+    <label for="useAudioDucking" class="i18n" msgid="options_audio_ducking">
+      Enable audio ducking.

[dmazzoni, 2016/12/09 18:30:10]

How about: Duck other audio when ChromeVox is speaking

+    </label>
+  </div>
+
+  <div class="option">
+    <input id="useAudioSuspension" type="checkbox" class="checkbox pref" name="useAudioSuspension" />
+    <label for="useAudioSuspension" class="i18n" msgid="options_audio_suspension">
+      Enable audio suspension.

[dmazzoni, 2016/12/09 18:30:10]

How about radio buttons? It doesn't make sense to me to
support both checkboxes when there's no point to having
them both on.

Something like, "When speaking, (a) Do nothing, (b) Duck other audio, (c)
Suspend other audio"

+    </label>
+  </div>
+
   <h2 class="i18n" msgid="options_voices">Voices</h2>
   <p class="i18n description" msgid="options_voices_description" id="voices_description">
     Change the current voice by selecting an option from the list below.