Add OpenSL ES enable setting to AppRTCDemo.

webrtc/examples/androidapp/res/xml/preferences.xml

Index: webrtc/examples/androidapp/res/xml/preferences.xml
diff --git a/webrtc/examples/androidapp/res/xml/preferences.xml b/webrtc/examples/androidapp/res/xml/preferences.xml
index c580e0cb777060e1f043439175ff20fcaae96fa2..8c111e0dfa01d07292365b80470773cee664a6d1 100644
--- a/webrtc/examples/androidapp/res/xml/preferences.xml
+++ b/webrtc/examples/androidapp/res/xml/preferences.xml
@@ -94,18 +94,18 @@
             android:title="@string/pref_noaudioprocessing_title"
             android:dialogTitle="@string/pref_noaudioprocessing_dlg"
             android:defaultValue="@string/pref_noaudioprocessing_default" />
+
+        <CheckBoxPreference
+            android:key="@string/pref_opensles_key"
+            android:title="@string/pref_opensles_title"
+            android:dialogTitle="@string/pref_opensles_dlg"
+            android:defaultValue="@string/pref_opensles_default" />
     </PreferenceCategory>
 
     <PreferenceCategory
         android:key="@string/pref_miscsettings_key"
         android:title="@string/pref_miscsettings_title">
 
-        <CheckBoxPreference
-            android:key="@string/pref_cpu_usage_detection_key"
-            android:title="@string/pref_cpu_usage_detection_title"
-            android:dialogTitle="@string/pref_cpu_usage_detection_dlg"
-            android:defaultValue="@string/pref_cpu_usage_detection_default" />
-
         <EditTextPreference
             android:key="@string/pref_room_server_url_key"
             android:title="@string/pref_room_server_url_title"