Frameworks: Fix Binder.joinThreadPool

Fix the lack of a native implementation.

(cherry picked from commit acd1987950)

Bug: 75254055
Bug: 75291614
Test: atest BinderTest
Merged-In: Id5b15442a59851e566a24d406a7487f9de66d42f
Change-Id: Id5b15442a59851e566a24d406a7487f9de66d42f

core/java/android/os/Binder.java

@@ -22,6 +22,7 @@ import android.util.ExceptionUtils;
 import android.util.Log;
 import android.util.Slog;
 
+import com.android.internal.os.BinderInternal;
 import com.android.internal.util.FastPrintWriter;
 import com.android.internal.util.FunctionalUtils.ThrowingRunnable;
 import com.android.internal.util.FunctionalUtils.ThrowingSupplier;
@@ -361,7 +362,9 @@ public class Binder implements IBinder {
      * Add the calling thread to the IPC thread pool.  This function does
      * not return until the current process is exiting.
      */
-    public static final native void joinThreadPool();
+    public static final void joinThreadPool() {
+        BinderInternal.joinThreadPool();
+    }
 
     /**
      * Returns true if the specified interface is a proxy.