surfaceflinger: Check sideband stream changed to trigger sideband Layer update.

BUG: 17382907
Change-Id: I65fd037bd25238ae68a3976468ae7fd7ce49c562
diff --git a/services/surfaceflinger/Layer.h b/services/surfaceflinger/Layer.h
index e712523..f0fe58a 100644
--- a/services/surfaceflinger/Layer.h
+++ b/services/surfaceflinger/Layer.h
@@ -284,7 +284,7 @@
     /*
      * Returns if a frame is queued.
      */
-    bool hasQueuedFrame() const { return mQueuedFrames > 0; }
+    bool hasQueuedFrame() const { return mQueuedFrames > 0 || mSidebandStreamChanged; }
 
     // -----------------------------------------------------------------------