Mark 4 tests as FlakyTest

Until b/113616538 is fixed, a test class without FlakyTest, can be included in
a presubmit test mapping suite unexpectedly. Mark these 3 classes as FlakyTest
for now:
ActivityManagerServiceTest
AssistDataRequesterTest
AppErrorDialogTest

This test becomes unstable and still needs to be fixed before it can run in
presubmit:
TaskPositioningControllerTests

Bug: 117880789
Test: none
Change-Id: I068d010fa328fa0ec36c8898e21cdf2da7abf0a2
diff --git a/services/tests/servicestests/src/com/android/server/am/AppErrorDialogTest.java b/services/tests/servicestests/src/com/android/server/am/AppErrorDialogTest.java
index 3819e21..06d41f1 100644
--- a/services/tests/servicestests/src/com/android/server/am/AppErrorDialogTest.java
+++ b/services/tests/servicestests/src/com/android/server/am/AppErrorDialogTest.java
@@ -21,6 +21,7 @@
 
 import androidx.test.InstrumentationRegistry;
 import androidx.test.annotation.UiThreadTest;
+import androidx.test.filters.FlakyTest;
 import androidx.test.filters.SmallTest;
 import androidx.test.runner.AndroidJUnit4;
 
@@ -37,6 +38,7 @@
  */
 @RunWith(AndroidJUnit4.class)
 @SmallTest
+@FlakyTest(bugId = 113616538)
 public class AppErrorDialogTest {
 
     private Context mContext;