Add system tray support (#10873)

Android.mk

@@ -78,6 +78,7 @@ LOCAL_SRC_FILES := \
 	$(wildcard $(LOCAL_PATH)/src/time/unix/*.c) \
 	$(wildcard $(LOCAL_PATH)/src/timer/*.c) \
 	$(wildcard $(LOCAL_PATH)/src/timer/unix/*.c) \
+	$(wildcard $(LOCAL_PATH)/src/tray/dummy/*.c) \
 	$(wildcard $(LOCAL_PATH)/src/video/*.c) \
 	$(wildcard $(LOCAL_PATH)/src/video/android/*.c) \
 	$(wildcard $(LOCAL_PATH)/src/video/yuv2rgb/*.c))