diff --git a/services/core/java/com/android/server/am/ActivityTaskManagerService.java b/services/core/java/com/android/server/am/ActivityTaskManagerService.java
index a4fd428..6398680 100644
--- a/services/core/java/com/android/server/am/ActivityTaskManagerService.java
+++ b/services/core/java/com/android/server/am/ActivityTaskManagerService.java
@@ -68,25 +68,24 @@
 import static android.view.WindowManager.TRANSIT_TASK_OPEN;
 import static android.view.WindowManager.TRANSIT_TASK_TO_FRONT;
 
-import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_ALL;
-import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_CONFIGURATION;
-import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_FOCUS;
-import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_IMMERSIVE;
-import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_LOCKTASK;
-import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_STACK;
-import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_SWITCH;
-import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_TASKS;
-import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_VISIBILITY;
-import static com.android.server.am.ActivityManagerDebugConfig.POSTFIX_CONFIGURATION;
-import static com.android.server.am.ActivityManagerDebugConfig.POSTFIX_FOCUS;
-import static com.android.server.am.ActivityManagerDebugConfig.POSTFIX_IMMERSIVE;
-import static com.android.server.am.ActivityManagerDebugConfig.POSTFIX_LOCKTASK;
-import static com.android.server.am.ActivityManagerDebugConfig.POSTFIX_STACK;
-import static com.android.server.am.ActivityManagerDebugConfig.POSTFIX_SWITCH;
-import static com.android.server.am.ActivityManagerDebugConfig.POSTFIX_VISIBILITY;
-import static com.android.server.am.ActivityManagerDebugConfig.TAG_AM;
-import static com.android.server.am.ActivityManagerDebugConfig.TAG_WITH_CLASS_NAME;
-import static com.android.server.am.ActivityManagerService.ANIMATE;
+import static com.android.server.am.ActivityTaskManagerDebugConfig.DEBUG_ALL;
+import static com.android.server.am.ActivityTaskManagerDebugConfig.DEBUG_CONFIGURATION;
+import static com.android.server.am.ActivityTaskManagerDebugConfig.DEBUG_FOCUS;
+import static com.android.server.am.ActivityTaskManagerDebugConfig.DEBUG_IMMERSIVE;
+import static com.android.server.am.ActivityTaskManagerDebugConfig.DEBUG_LOCKTASK;
+import static com.android.server.am.ActivityTaskManagerDebugConfig.DEBUG_STACK;
+import static com.android.server.am.ActivityTaskManagerDebugConfig.DEBUG_SWITCH;
+import static com.android.server.am.ActivityTaskManagerDebugConfig.DEBUG_TASKS;
+import static com.android.server.am.ActivityTaskManagerDebugConfig.DEBUG_VISIBILITY;
+import static com.android.server.am.ActivityTaskManagerDebugConfig.POSTFIX_CONFIGURATION;
+import static com.android.server.am.ActivityTaskManagerDebugConfig.POSTFIX_FOCUS;
+import static com.android.server.am.ActivityTaskManagerDebugConfig.POSTFIX_IMMERSIVE;
+import static com.android.server.am.ActivityTaskManagerDebugConfig.POSTFIX_LOCKTASK;
+import static com.android.server.am.ActivityTaskManagerDebugConfig.POSTFIX_STACK;
+import static com.android.server.am.ActivityTaskManagerDebugConfig.POSTFIX_SWITCH;
+import static com.android.server.am.ActivityTaskManagerDebugConfig.POSTFIX_VISIBILITY;
+import static com.android.server.am.ActivityTaskManagerDebugConfig.TAG_ATM;
+import static com.android.server.am.ActivityTaskManagerDebugConfig.TAG_WITH_CLASS_NAME;
 import static com.android.server.am.ActivityManagerService.MY_PID;
 import static com.android.server.am.ActivityManagerService.STOCK_PM_FLAGS;
 import static com.android.server.am.ActivityManagerService.dumpStackTraces;
@@ -99,7 +98,7 @@
 import static com.android.server.am.ActivityStackSupervisor.REMOVE_FROM_RECENTS;
 import static com.android.server.am.ActivityTaskManagerService.H.REPORT_TIME_TRACKER_MSG;
 import static com.android.server.am.ActivityTaskManagerService.UiHandler.DISMISS_DIALOG_UI_MSG;
-import static com.android.server.am.TaskRecord.INVALID_TASK_ID;
+import static android.app.ActivityTaskManager.INVALID_TASK_ID;
 import static com.android.server.am.TaskRecord.LOCK_TASK_AUTH_DONT_LOCK;
 import static com.android.server.am.TaskRecord.REPARENT_KEEP_STACK_AT_FRONT;
 import static com.android.server.am.TaskRecord.REPARENT_LEAVE_STACK_IN_PLACE;
@@ -140,7 +139,6 @@
 import android.app.admin.DevicePolicyCache;
 import android.app.assist.AssistContent;
 import android.app.assist.AssistStructure;
-import android.app.usage.UsageEvents;
 import android.app.usage.UsageStatsManagerInternal;
 import android.content.ActivityNotFoundException;
 import android.content.ComponentName;
@@ -258,7 +256,7 @@
  * {@hide}
  */
 public class ActivityTaskManagerService extends IActivityTaskManager.Stub {
-    private static final String TAG = TAG_WITH_CLASS_NAME ? "ActivityTaskManagerService" : TAG_AM;
+    private static final String TAG = TAG_WITH_CLASS_NAME ? "ActivityTaskManagerService" : TAG_ATM;
     private static final String TAG_STACK = TAG + POSTFIX_STACK;
     private static final String TAG_SWITCH = TAG + POSTFIX_SWITCH;
     private static final String TAG_IMMERSIVE = TAG + POSTFIX_IMMERSIVE;
@@ -272,6 +270,9 @@
     // How long we wait until we timeout on key dispatching during instrumentation.
     private static final int INSTRUMENTATION_KEY_DISPATCHING_TIMEOUT_MS = 60 * 1000;
 
+    /** Used to indicate that an app transition should be animated. */
+    static final boolean ANIMATE = true;
+
     /** Hardware-reported OpenGLES version. */
     final int GL_ES_VERSION;
 
@@ -5386,6 +5387,8 @@
 
     final class H extends Handler {
         static final int REPORT_TIME_TRACKER_MSG = 1;
+        static final int FIRST_ACTIVITY_STACK_MSG = 100;
+        static final int FIRST_SUPERVISOR_STACK_MSG = 200;
 
         public H(Looper looper) {
             super(looper, null, true);