Announcing quick settings changes now via talkback

All tiles now report when their state changes due
to a user clicking on it. Also cleaned up some accessibility
strings.

Bug: 15682239
Change-Id: Ide97fb97a0253618db206562573dadd0036dab45
diff --git a/packages/SystemUI/src/com/android/systemui/qs/QSPanel.java b/packages/SystemUI/src/com/android/systemui/qs/QSPanel.java
index bf01b7b..c1fd509 100644
--- a/packages/SystemUI/src/com/android/systemui/qs/QSPanel.java
+++ b/packages/SystemUI/src/com/android/systemui/qs/QSPanel.java
@@ -239,6 +239,11 @@
                     fireScanStateChanged(r.scanState);
                 }
             }
+
+            @Override
+            public void onAnnouncementRequested(CharSequence announcement) {
+                announceForAccessibility(announcement);
+            }
         };
         r.tile.setCallback(callback);
         final View.OnClickListener click = new View.OnClickListener() {