Expose getTaskInfo on TaskView

There's a bunch of useful stuff on TaskInfo (e.g. taskDescription and
background color). This exposes the existing method on TaskView so
users of TaskView can get this info.

Bug: 237678727
Test: none
Change-Id: I95e4bc37562a9f51b2cf6cec6d03889f57222e30

libs/WindowManager/Shell/src/com/android/wm/shell/TaskView.java

@@ -517,7 +517,9 @@ public class TaskView extends SurfaceView implements SurfaceHolder.Callback,
         getViewTreeObserver().removeOnComputeInternalInsetsListener(this);
     }
 
-    ActivityManager.RunningTaskInfo getTaskInfo() {
+    /** Returns the task info for the task in the TaskView. */
+    @Nullable
+    public ActivityManager.RunningTaskInfo getTaskInfo() {
         return mTaskInfo;
     }