Add AIDL for registering ConnectivityDiagnosticCallbacks.

ConnectivityService needs to allow for registering and unregistering
ConnectivityDiagnosticsCallbacks as part of ConnectivityDiagnostics API.
These methods will be used by ConnectivityDiagnosticsManager so that
privileged applications can receive notifications on network events by
the system.

Bug: 146444622
Test: compiles
Change-Id: Id00b30af5692db5eef47d0d948897148578d3b32
diff --git a/core/java/android/net/IConnectivityManager.aidl b/core/java/android/net/IConnectivityManager.aidl
index 186196b..3e9e7fa 100644
--- a/core/java/android/net/IConnectivityManager.aidl
+++ b/core/java/android/net/IConnectivityManager.aidl
@@ -18,6 +18,7 @@
 
 import android.app.PendingIntent;
 import android.net.ConnectionInfo;
+import android.net.IConnectivityDiagnosticsCallback;
 import android.net.LinkProperties;
 import android.net.Network;
 import android.net.NetworkAgentConfig;
@@ -211,5 +212,9 @@
     boolean isCallerCurrentAlwaysOnVpnApp();
     boolean isCallerCurrentAlwaysOnVpnLockdownApp();
 
+    void registerConnectivityDiagnosticsCallback(in IConnectivityDiagnosticsCallback callback,
+            in NetworkRequest request);
+    void unregisterConnectivityDiagnosticsCallback(in IConnectivityDiagnosticsCallback callback);
+
     IBinder startOrGetTestNetworkService();
 }
diff --git a/services/core/java/com/android/server/ConnectivityService.java b/services/core/java/com/android/server/ConnectivityService.java
index 11f0a04..0981cd8 100644
--- a/services/core/java/com/android/server/ConnectivityService.java
+++ b/services/core/java/com/android/server/ConnectivityService.java
@@ -66,6 +66,7 @@
 import android.net.ConnectionInfo;
 import android.net.ConnectivityManager;
 import android.net.ICaptivePortal;
+import android.net.IConnectivityDiagnosticsCallback;
 import android.net.IConnectivityManager;
 import android.net.IDnsResolver;
 import android.net.IIpConnectivityMetrics;
@@ -7307,4 +7308,20 @@
             return mTNS;
         }
     }
+
+    @Override
+    public void registerConnectivityDiagnosticsCallback(
+            @NonNull IConnectivityDiagnosticsCallback callback, @NonNull NetworkRequest request) {
+        // TODO(b/146444622): implement register IConnectivityDiagnosticsCallback functionality
+        throw new UnsupportedOperationException(
+                "registerConnectivityDiagnosticsCallback not yet implemented");
+    }
+
+    @Override
+    public void unregisterConnectivityDiagnosticsCallback(
+            @NonNull IConnectivityDiagnosticsCallback callback) {
+        // TODO(b/146444622): implement register IConnectivityDiagnosticsCallback functionality
+        throw new UnsupportedOperationException(
+                "unregisterConnectivityDiagnosticsCallback not yet implemented");
+    }
 }