[Thread] make InfraInterfaceController mockable

It's generally discouraged to mock a static method, so this commit
changes InfraInterfaceController#createIcmp6Socket to non-static method
and inject InfraInterfaceController into ThreadNetworkControllerService
as an external dependency.

Bug: 317555104
Change-Id: I6f88c02858279223684c781dc065a9bf84ae15ab
diff --git a/thread/service/java/com/android/server/thread/InfraInterfaceController.java b/thread/service/java/com/android/server/thread/InfraInterfaceController.java
index d7c49a0..be54cbc 100644
--- a/thread/service/java/com/android/server/thread/InfraInterfaceController.java
+++ b/thread/service/java/com/android/server/thread/InfraInterfaceController.java
@@ -36,8 +36,7 @@
      * @return an ICMPv6 socket file descriptor on the Infrastructure network interface.
      * @throws IOException when fails to create the socket.
      */
-    public static ParcelFileDescriptor createIcmp6Socket(String infraInterfaceName)
-            throws IOException {
+    public ParcelFileDescriptor createIcmp6Socket(String infraInterfaceName) throws IOException {
         return ParcelFileDescriptor.adoptFd(nativeCreateIcmp6Socket(infraInterfaceName));
     }
 
diff --git a/thread/service/java/com/android/server/thread/ThreadNetworkControllerService.java b/thread/service/java/com/android/server/thread/ThreadNetworkControllerService.java
index 1d8cd73..442c2d0 100644
--- a/thread/service/java/com/android/server/thread/ThreadNetworkControllerService.java
+++ b/thread/service/java/com/android/server/thread/ThreadNetworkControllerService.java
@@ -138,6 +138,7 @@
     private final Supplier<IOtDaemon> mOtDaemonSupplier;
     private final ConnectivityManager mConnectivityManager;
     private final TunInterfaceController mTunIfController;
+    private final InfraInterfaceController mInfraIfController;
     private final LinkProperties mLinkProperties = new LinkProperties();
     private final OtDaemonCallbackProxy mOtDaemonCallbackProxy = new OtDaemonCallbackProxy();
 
@@ -163,7 +164,8 @@
             NetworkProvider networkProvider,
             Supplier<IOtDaemon> otDaemonSupplier,
             ConnectivityManager connectivityManager,
-            TunInterfaceController tunIfController) {
+            TunInterfaceController tunIfController,
+            InfraInterfaceController infraIfController) {
         mContext = context;
         mHandlerThread = handlerThread;
         mHandler = new Handler(handlerThread.getLooper());
@@ -171,6 +173,7 @@
         mOtDaemonSupplier = otDaemonSupplier;
         mConnectivityManager = connectivityManager;
         mTunIfController = tunIfController;
+        mInfraIfController = infraIfController;
         mUpstreamNetworkRequest = newUpstreamNetworkRequest();
         mNetworkToInterface = new HashMap<Network, String>();
         mBorderRouterConfig = new BorderRouterConfigurationParcel();
@@ -188,7 +191,8 @@
                 networkProvider,
                 () -> IOtDaemon.Stub.asInterface(ServiceManagerWrapper.waitForService("ot_daemon")),
                 context.getSystemService(ConnectivityManager.class),
-                new TunInterfaceController(TUN_IF_NAME));
+                new TunInterfaceController(TUN_IF_NAME),
+                new InfraInterfaceController());
     }
 
     private static NetworkCapabilities newNetworkCapabilities() {
@@ -747,7 +751,7 @@
         try {
             mBorderRouterConfig.infraInterfaceName = infraIfName;
             mBorderRouterConfig.infraInterfaceIcmp6Socket =
-                    InfraInterfaceController.createIcmp6Socket(infraIfName);
+                    mInfraIfController.createIcmp6Socket(infraIfName);
             mBorderRouterConfig.isBorderRoutingEnabled = true;
 
             mOtDaemon.configureBorderRouter(