Expose registerDefaultNetworkCallbackAsUid.

Bug: 165835257
Test: atest FrameworksNetTests
Change-Id: I638ed5cd5273d456919630aba1e22f099df1b36c
diff --git a/framework/api/module-lib-current.txt b/framework/api/module-lib-current.txt
index aa7a0ac..f32f08d 100644
--- a/framework/api/module-lib-current.txt
+++ b/framework/api/module-lib-current.txt
@@ -11,6 +11,7 @@
     method @Nullable public android.net.ProxyInfo getGlobalProxy();
     method @NonNull public static android.util.Range<java.lang.Integer> getIpSecNetIdRange();
     method @NonNull public static String getPrivateDnsMode(@NonNull android.content.Context);
+    method @RequiresPermission(anyOf={android.net.NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK, android.Manifest.permission.NETWORK_SETTINGS}) public void registerDefaultNetworkCallbackAsUid(int, @NonNull android.net.ConnectivityManager.NetworkCallback, @NonNull android.os.Handler);
     method @RequiresPermission(anyOf={android.net.NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK, android.Manifest.permission.NETWORK_SETTINGS}) public void registerSystemDefaultNetworkCallback(@NonNull android.net.ConnectivityManager.NetworkCallback, @NonNull android.os.Handler);
     method @RequiresPermission(anyOf={android.Manifest.permission.NETWORK_SETTINGS, android.Manifest.permission.NETWORK_STACK, android.net.NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK}) public void requestBackgroundNetwork(@NonNull android.net.NetworkRequest, @NonNull android.os.Handler, @NonNull android.net.ConnectivityManager.NetworkCallback);
     method @RequiresPermission(anyOf={android.Manifest.permission.NETWORK_SETTINGS, android.Manifest.permission.NETWORK_SETUP_WIZARD, android.Manifest.permission.NETWORK_STACK, android.net.NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK}) public void setAcceptPartialConnectivity(@NonNull android.net.Network, boolean, boolean);
diff --git a/framework/src/android/net/ConnectivityManager.java b/framework/src/android/net/ConnectivityManager.java
index 1a5299b..2e240f9 100644
--- a/framework/src/android/net/ConnectivityManager.java
+++ b/framework/src/android/net/ConnectivityManager.java
@@ -4252,7 +4252,7 @@
      * @throws RuntimeException if the app already has too many callbacks registered.
      * @hide
      */
-    // TODO: @SystemApi(client=MODULE_LIBRARIES)
+    @SystemApi(client = MODULE_LIBRARIES)
     @SuppressLint({"ExecutorRegistration", "PairedRegistration"})
     @RequiresPermission(anyOf = {
             NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK,