ContentDescription for transparent area above QC

For TalkBack support.

Change-Id: I7e7c5f7e83af25a5d37c612d07d4d09a8d58d464
diff --git a/res/layout/quickcontact_activity.xml b/res/layout/quickcontact_activity.xml
index 7b81ea2..008062b 100644
--- a/res/layout/quickcontact_activity.xml
+++ b/res/layout/quickcontact_activity.xml
@@ -27,6 +27,7 @@
     <View
         android:layout_width="match_parent"
         android:layout_height="@dimen/quickcontact_starting_empty_height"
+        android:contentDescription="@string/quickcontact_transparent_view_description"
         android:id="@+id/transparent_view" />
 
     <include layout="@layout/quickcontact_header" />