Fill in mic_positions property.

chromeos/dbus/cras_audio_client.cc

Index: chromeos/dbus/cras_audio_client.cc
diff --git a/chromeos/dbus/cras_audio_client.cc b/chromeos/dbus/cras_audio_client.cc
index 29e26536c8d3c1f501e7e3ef1fcb6f73c273e962..e8c3a8be93019d10094238ea9d170c874b0e6470 100644
--- a/chromeos/dbus/cras_audio_client.cc
+++ b/chromeos/dbus/cras_audio_client.cc
@@ -408,6 +408,9 @@ class CrasAudioClientImpl : public CrasAudioClient {
       } else if (key == cras::kPluggedTimeProperty) {
         if (!value_reader.PopUint64(&node->plugged_time))
           return false;
+      } else if (key == cras::kMicPositionsProperty) {
+        if (!value_reader.PopString(&node->mic_positions))
+          return false;
       }
     }