Add aecdump support to AppRTCDemo

webrtc/examples/androidapp/res/values/strings.xml

 <?xml version="1.0" encoding="utf-8"?>
 <resources>
     <string name="app_name" translatable="no">AppRTC</string>
     <string name="settings_name" translatable="no">AppRTC Settings</string>
     <string name="disconnect_call">Disconnect Call</string>
     <string name="room_names">Room names:</string>
     <string name="room_description">
         Please enter a room name. Room names are shared with everyone, so think
         of something unique and send it to a friend.
     </string>
@@ skipping 84 matching lines @@
     <string name="pref_audiocodec_key">audiocodec_preference</string>
     <string name="pref_audiocodec_title">Default audio codec.</string>
     <string name="pref_audiocodec_dlg">Select default audio codec.</string>
     <string name="pref_audiocodec_default">OPUS</string>
 
     <string name="pref_noaudioprocessing_key">audioprocessing_preference</string>
     <string name="pref_noaudioprocessing_title">Disable audio processing.</string>
     <string name="pref_noaudioprocessing_dlg">Disable audio processing pipeline.</string>
     <string name="pref_noaudioprocessing_default">false</string>
 
+    <string name="pref_aecdump_key">aecdump_preference</string>
+    <string name="pref_aecdump_title">Create aecdump.</string>
+    <string name="pref_aecdump_dlg">Enable diagnostic audio recordings.</string>
+    <string name="pref_aecdump_default">false</string>
+
     <string name="pref_opensles_key">opensles_preference</string>
     <string name="pref_opensles_title">Use OpenSL ES for audio playback.</string>
     <string name="pref_opensles_dlg">Use OpenSL ES for audio playback.</string>
     <string name="pref_opensles_default">false</string>
 
     <string name="pref_miscsettings_key">misc_settings_key</string>
     <string name="pref_miscsettings_title">Miscellaneous settings.</string>
 
     <string name="pref_room_server_url_key">room_server_url_preference</string>
     <string name="pref_room_server_url_title">Room server URL.</string>
     <string name="pref_room_server_url_dlg">Enter a room server URL.</string>
     <string name="pref_room_server_url_default" translatable="false">https://apprtc.appspot.com</string>
 
     <string name="pref_displayhud_key">displayhud_preference</string>
     <string name="pref_displayhud_title">Display call statistics.</string>
     <string name="pref_displayhud_dlg">Display call statistics.</string>
     <string name="pref_displayhud_default" translatable="false">false</string>
 
 </resources>