AppErrors: Don't suppress dialogs when ANR_SHOW_BACKGROUND is set

Change-Id: Ie6013013ff4e23e51e471e97d15e113cc759657e
Fixes: 30929056
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index 5da55b1..87d7348 100755
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -5839,6 +5839,8 @@
         /**
          * If nonzero, ANRs in invisible background processes bring up a dialog.
          * Otherwise, the process will be silently killed.
+         *
+         * Also prevents ANRs and crash dialogs from being suppressed.
          * @hide
          */
         public static final String ANR_SHOW_BACKGROUND = "anr_show_background";