Stop ANR dialogs from appearing when ActivityManager dialogs should not be shown

Stop ANR dialogs from appearing on devices where the ActivityManager dialogs
should not be shown. Instead, kill the process. This is preferable because the
user can't actually do anything on the device.

TESTED = runs on device with that config, simulated ANR using test app.

Change-Id: I6267000afd12ef929f0c625220184c6ab0139552

Author: scrubskip

services/java/com/android/server/am/ActivityManagerService.java

@@ -933,11 +933,15 @@ public void handleMessage(Message msg) {
                     broadcastIntentLocked(null, null, intent,
                             null, null, 0, null, null, null,
                             false, false, MY_PID, Process.SYSTEM_UID);
-
-                    Dialog d = new AppNotRespondingDialog(ActivityManagerService.this,
-                            mContext, proc, (ActivityRecord)data.get("activity"));
-                    d.show();
-                    proc.anrDialog = d;
+                    if (mShowDialogs) {
+                        Dialog d = new AppNotRespondingDialog(ActivityManagerService.this,
+                                mContext, proc, (ActivityRecord) data.get("activity"));
+                        d.show();
+                        proc.anrDialog = d;
+                    } else {
+                        // Just kill the app if there is no dialog to be shown.
+                        killAppAtUsersRequest(proc, null);
+                    }
                 }
 
                 ensureBootCompleted();