Bug 860879 - Throw an exception after 5 seconds timeout when returning PromptService result; r=kats

mobile/android/base/PromptService.java

@@ -467,8 +467,11 @@ public class PromptService implements OnClickListener, OnCancelListener, OnItemC
         mDialog = null;
         mSelected = null;
         try {
-            sPromptQueue.put(aReturn);
-        } catch(Exception ex) {
+            if (!sPromptQueue.offer(aReturn, 5, TimeUnit.SECONDS)) {
+                ThreadUtils.dumpAllStackTraces();
+                throw new ThreadUtils.UiThreadBlockedException();
+            }
+        } catch(InterruptedException ex) {
             Log.d(LOGTAG, "sPromptQueue not ready yet");
         }
     }