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..799c7268012e8e068694c9c05042f9caa84fe83f 100644
--- a/chrome/browser/resources/chromeos/chromevox/chromevox/background/options.html
+++ b/chrome/browser/resources/chromeos/chromevox/chromevox/background/options.html
@@ -34,13 +34,32 @@
     </label>
   </div>
 
+  <p class="i18n description" msgid="options_audio_description" id="audio_description">
+    When playing audio
+  </p>
+
+  <div>
+    <select id="audioStrategy" class="pref" aria-labelledby="audio_description">
+      <option id="audioNormal" class="i18n" msgid="options_audio_normal">
+        play at normal volume even if ChromeVox is speaking
+      </option>
+      <option id="audioDuck" class="i18n" msgid="options_audio_duck">
+        play at lower volume when ChromeVox is speaking
+      </option>
+      <option id="audioSuspend" class="i18n" msgid="options_audio_suspend">
+        pause playback when ChromeVox is speaking
+      </option>
+</select>

[dmazzoni, 2016/12/13 21:02:19]

nit: indent

+    <br><br>
+  </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.
   </p>
 
   <div>
-    <select class="pref" id="voices" aria-labelledby="voices_description"></select>
+    <select id="voices" aria-labelledby="voices_description"></select>
     <br><br>
   </div>
 
@@ -50,11 +69,11 @@
     <p class="i18n description" msgid="options_braille_description_6" id="braille_description_6">
       Change the current 6 dot braille table by selecting an option from the list below.
     </p>
-    <select class="pref" id="brailleTable6" aria-labelledby="braille_description_6"></select>
+    <select id="brailleTable6" aria-labelledby="braille_description_6"></select>
     <p class="i18n description" msgid="options_braille_description_8" id="braille_description_8">
       Change the current 8 dot braille table by selecting an option from the list below.
     </p>
-    <select class="pref" id="brailleTable8" aria-labelledby="braille_description_8"></select>
+    <select id="brailleTable8" aria-labelledby="braille_description_8"></select>
     <button id="brailleTableType"></button>
     <div class="option">
       <label>