Add alarm volume to the list of volumes in the volume overlay.

This will be used only for adjusting the alarm volume when an
alarm ringtone is being selected.

Bug: 5164828
Change-Id: Ia4a12b1946fb0715e97101bfd389c6bd33c448c7

Author: Amith Yamasani

core/java/android/view/VolumePanel.java

@@ -134,6 +134,11 @@ private enum StreamResources {
                 R.drawable.ic_audio_phone,
                 R.drawable.ic_audio_phone,
                 false),
+        AlarmStream(AudioManager.STREAM_ALARM,
+                R.string.volume_alarm,
+                R.drawable.ic_audio_alarm,
+                R.drawable.ic_audio_alarm_mute,
+                false),
         MediaStream(AudioManager.STREAM_MUSIC,
                 R.string.volume_icon_description_media,
                 R.drawable.ic_audio_vol,
@@ -167,7 +172,8 @@ private enum StreamResources {
         StreamResources.RingerStream,
         StreamResources.VoiceStream,
         StreamResources.MediaStream,
-        StreamResources.NotificationStream
+        StreamResources.NotificationStream,
+        StreamResources.AlarmStream
     };
 
     /** Object that contains data for each slider */