Fix trampoline activities when relaunching PiP

- We should be checking the actual launched-from package since that stores
  the source package across trampoline activities

Bug: 35458117
Test: Enter PiP from a trampoline activity, launch again from Launcher
      and ensure that it is expanded

Change-Id: Ia0e586e8b21dee63b513bd61a41a24e7da4325e1

core/java/android/app/ITaskStackListener.aidl

@@ -32,9 +32,10 @@ oneway interface ITaskStackListener {
      * running in the pinned stack and the activity is not actually started, but the task is either
      * brought to the front or a new Intent is delivered to it.
      *
-     * @param sourceComponent the component name of the activity that initiated the restart attempt
+     * @param launchedFromPackage the package name of the activity that initiated the restart
+     *                            attempt
      */
-    void onPinnedActivityRestartAttempt(in ComponentName sourceComponent);
+    void onPinnedActivityRestartAttempt(String launchedFromPackage);
 
     /**
      * Called whenever the pinned stack is done animating a resize.

core/java/android/app/TaskStackListener.java

@@ -35,7 +35,7 @@ public abstract class TaskStackListener extends ITaskStackListener.Stub {
     }
 
     @Override
-    public void onPinnedActivityRestartAttempt(ComponentName sourceComponent) throws RemoteException {
+    public void onPinnedActivityRestartAttempt(String launchedFromPackage) throws RemoteException {
     }
 
     @Override