Remove use of TaskTile

We just have the TaskOrganizer create root task directly

Test: Existing tests pass
Bug: 133381284
Bug: 149429752
Change-Id: Id884cbe8e7d2fdd93e729fcb2793fad4afd59b21
diff --git a/services/core/java/com/android/server/wm/TaskOrganizerController.java b/services/core/java/com/android/server/wm/TaskOrganizerController.java
index 5523678..05b721b 100644
--- a/services/core/java/com/android/server/wm/TaskOrganizerController.java
+++ b/services/core/java/com/android/server/wm/TaskOrganizerController.java
@@ -17,6 +17,7 @@
 package com.android.server.wm;
 
 import static android.Manifest.permission.MANAGE_ACTIVITY_STACKS;
+import static android.app.WindowConfiguration.ACTIVITY_TYPE_UNDEFINED;
 import static android.app.WindowConfiguration.WINDOWING_MODE_MULTI_WINDOW;
 import static android.app.WindowConfiguration.WINDOWING_MODE_PINNED;
 import static android.app.WindowConfiguration.WINDOWING_MODE_SPLIT_SCREEN_PRIMARY;
@@ -27,13 +28,14 @@
 
 import android.annotation.Nullable;
 import android.app.ActivityManager.RunningTaskInfo;
+import android.content.Intent;
 import android.content.pm.ActivityInfo;
 import android.os.Binder;
 import android.os.IBinder;
 import android.os.RemoteException;
 import android.util.Slog;
-import android.window.ITaskOrganizerController;
 import android.window.ITaskOrganizer;
+import android.window.ITaskOrganizerController;
 import android.window.IWindowContainer;
 
 import com.android.internal.util.ArrayUtils;
@@ -255,11 +257,12 @@
                 if (display == null) {
                     return null;
                 }
-                final int nextId = display.getNextStackId();
-                TaskTile tile = new TaskTile(mService, nextId, windowingMode);
-                display.addTile(tile);
-                RunningTaskInfo out = tile.getTaskInfo();
-                mLastSentTaskInfos.put(tile, out);
+
+                final Task task = display.getOrCreateStack(windowingMode, ACTIVITY_TYPE_UNDEFINED,
+                        false /* onTop */, new Intent(), null /* candidateTask */,
+                        true /* createdByOrganizer */);
+                RunningTaskInfo out = task.getTaskInfo();
+                mLastSentTaskInfos.put(task, out);
                 return out;
             }
         } finally {
@@ -273,11 +276,13 @@
         final long origId = Binder.clearCallingIdentity();
         try {
             synchronized (mGlobalLock) {
-                TaskTile tile = TaskTile.forToken(token.asBinder());
-                if (tile == null) {
-                    return false;
+                final Task task = WindowContainer.fromBinder(token.asBinder()).asTask();
+                if (task == null) return false;
+                if (!task.mCreatedByOrganizer) {
+                    throw new IllegalArgumentException(
+                            "Attempt to delete task not created by organizer task=" + task);
                 }
-                tile.removeImmediately();
+                task.removeImmediately();
                 return true;
             }
         } finally {
@@ -358,12 +363,7 @@
                 if (task == null) {
                     return null;
                 }
-                ActivityStack rootTask = (ActivityStack) task.getRootTask();
-                final TaskTile tile = rootTask.getTile();
-                if (tile != null) {
-                    rootTask = tile;
-                }
-                return rootTask.mRemoteToken;
+                return task.getRootTask().mRemoteToken;
             }
         } finally {
             Binder.restoreCallingIdentity(origId);
@@ -371,7 +371,7 @@
     }
 
     @Override
-    public void setLaunchRoot(int displayId, @Nullable IWindowContainer tile) {
+    public void setLaunchRoot(int displayId, @Nullable IWindowContainer token) {
         enforceStackPermission("setLaunchRoot()");
         final long origId = Binder.clearCallingIdentity();
         try {
@@ -380,16 +380,21 @@
                 if (display == null) {
                     return;
                 }
-                TaskTile taskTile = tile == null ? null : TaskTile.forToken(tile.asBinder());
-                if (taskTile == null) {
-                    display.mLaunchTile = null;
+                Task task = token == null
+                        ? null : WindowContainer.fromBinder(token.asBinder()).asTask();
+                if (task == null) {
+                    display.mLaunchRootTask = null;
                     return;
                 }
-                if (taskTile.getDisplay() != display) {
-                    throw new RuntimeException("Can't set launch root for display " + displayId
-                            + " to task on display " + taskTile.getDisplay().getDisplayId());
+                if (!task.mCreatedByOrganizer) {
+                    throw new IllegalArgumentException("Attempt to set task not created by "
+                            + "organizer as launch root task=" + task);
                 }
-                display.mLaunchTile = taskTile;
+                if (task.getDisplayContent() != display) {
+                    throw new RuntimeException("Can't set launch root for display " + displayId
+                            + " to task on display " + task.getDisplayContent().getDisplayId());
+                }
+                display.mLaunchRootTask = task;
             }
         } finally {
             Binder.restoreCallingIdentity(origId);
@@ -411,25 +416,25 @@
                     Slog.e(TAG, "Can't get children of " + parent + " because it is not valid.");
                     return null;
                 }
-                // For now, only support returning children of persistent root tasks (of which the
-                // only current implementation is TaskTile).
-                if (!(container instanceof TaskTile)) {
+                final Task task = container.asTask();
+                if (task == null) {
+                    Slog.e(TAG, container + " is not a task...");
+                    return null;
+                }
+                // For now, only support returning children of tasks created by the organizer.
+                if (!task.mCreatedByOrganizer) {
                     Slog.w(TAG, "Can only get children of root tasks created via createRootTask");
                     return null;
                 }
                 ArrayList<RunningTaskInfo> out = new ArrayList<>();
-                // Tiles aren't real parents, so we need to go through stacks on the display to
-                // ensure correct ordering.
-                final DisplayContent dc = container.getDisplayContent();
-                for (int i = dc.getStackCount() - 1; i >= 0; --i) {
-                    final ActivityStack as = dc.getStackAt(i);
-                    if (as.getTile() == container) {
-                        if (activityTypes != null
-                                && !ArrayUtils.contains(activityTypes, as.getActivityType())) {
-                            continue;
-                        }
-                        out.add(as.getTaskInfo());
+                for (int i = task.getChildCount() - 1; i >= 0; --i) {
+                    final Task child = task.getChildAt(i).asTask();
+                    if (child == null) continue;
+                    if (activityTypes != null
+                            && !ArrayUtils.contains(activityTypes, child.getActivityType())) {
+                        continue;
                     }
+                    out.add(child.getTaskInfo());
                 }
                 return out;
             }
@@ -451,12 +456,7 @@
                 }
                 ArrayList<RunningTaskInfo> out = new ArrayList<>();
                 for (int i = dc.getStackCount() - 1; i >= 0; --i) {
-                    final ActivityStack task = dc.getStackAt(i);
-                    if (task.getTile() != null) {
-                        // a tile is supposed to look like a parent, so don't include their
-                        // "children" here. They can be accessed via getChildTasks()
-                        continue;
-                    }
+                    final Task task = dc.getStackAt(i);
                     if (activityTypes != null
                             && !ArrayUtils.contains(activityTypes, task.getActivityType())) {
                         continue;