Add new methods to ITaskStackListener

Refactor task change notification logic into a separate class
TaskChangeNotificationController.

Add ActivityManagerService.unregisterTaskStackChangedListener

Add a no-op implementation that clients can subclass to avoid
having to reimplement all new methods when they are added.

Add new methods:
onTaskAdded
onTaskRemoved
onTaskMovedToFront
onTaskDescriptionChanged
onActivityRequestedOrientationChanged
onTaskFinishing

Design doc:
https://docs.google.com/document/d/1IgWZ44rKe9k1CzkjP2Mohv12OgRD1FxH8oLAyzhvCY4/edit#heading=h.yhzl6os0dbo5

Cherry-picked from I8302d6d3baf1ac1ca928765fe203091b9fab4070

Bug: 32277482
Test: Verify that callbacks are called in dummy implementations

Change-Id: I2ac2b870147ef049f3ee05fc5916c99332334526
diff --git a/services/tests/servicestests/AndroidManifest.xml b/services/tests/servicestests/AndroidManifest.xml
index 3548f28..4165467 100644
--- a/services/tests/servicestests/AndroidManifest.xml
+++ b/services/tests/servicestests/AndroidManifest.xml
@@ -4,9 +4,9 @@
      Licensed under the Apache License, Version 2.0 (the "License");
      you may not use this file except in compliance with the License.
      You may obtain a copy of the License at
-  
+
           http://www.apache.org/licenses/LICENSE-2.0
-  
+
      Unless required by applicable law or agreed to in writing, software
      distributed under the License is distributed on an "AS IS" BASIS,
      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@@ -30,6 +30,7 @@
     <uses-permission android:name="android.permission.INTERACT_ACROSS_USERS" />
     <uses-permission android:name="android.permission.REAL_GET_TASKS" />
     <uses-permission android:name="android.permission.GET_DETAILED_TASKS" />
+    <uses-permission android:name="android.permission.REORDER_TASKS" />
     <uses-permission android:name="android.permission.MANAGE_NETWORK_POLICY" />
     <uses-permission android:name="android.permission.READ_NETWORK_USAGE_HISTORY" />
     <uses-permission android:name="android.permission.MODIFY_NETWORK_ACCOUNTING" />
@@ -159,6 +160,9 @@
 
         <activity android:name="com.android.server.am.TaskStackChangedListenerTest$ActivityA" />
         <activity android:name="com.android.server.am.TaskStackChangedListenerTest$ActivityB" />
+        <activity android:name="com.android.server.am.TaskStackChangedListenerTest$ActivityRequestedOrientationChange" />
+        <activity android:name="com.android.server.am.TaskStackChangedListenerTest$ActivityTaskChangeCallbacks" />
+        <activity android:name="com.android.server.am.TaskStackChangedListenerTest$ActivityTaskDescriptionChange" />
 
     </application>