Expose NetworkAgent constructor taking a NetworkScore parameter

Vpn constructs NetworkAgent with this exposed NetworkAgent
constructor. Given NetworkAgent is moving into the incoming
connectivity module, Vpn which is outside the module will not
be able to access it if it's not in the API surface. Thus,
expose it to allow Vpn to use it.

Bug: 182963397
Test: make update-api
Change-Id: Ic2357dcfff3233e0dd17b48b0e376a5095ef60fa
Merged-In: Ic2357dcfff3233e0dd17b48b0e376a5095ef60fa
CTS-Coverage-Bug: 172183305
  (cherry-picked from ag/13966707)
diff --git a/framework/api/system-current.txt b/framework/api/system-current.txt
index 8c1fae9..11aa706 100644
--- a/framework/api/system-current.txt
+++ b/framework/api/system-current.txt
@@ -212,6 +212,7 @@
 
   public abstract class NetworkAgent {
     ctor public NetworkAgent(@NonNull android.content.Context, @NonNull android.os.Looper, @NonNull String, @NonNull android.net.NetworkCapabilities, @NonNull android.net.LinkProperties, int, @NonNull android.net.NetworkAgentConfig, @Nullable android.net.NetworkProvider);
+    ctor public NetworkAgent(@NonNull android.content.Context, @NonNull android.os.Looper, @NonNull String, @NonNull android.net.NetworkCapabilities, @NonNull android.net.LinkProperties, @NonNull android.net.NetworkScore, @NonNull android.net.NetworkAgentConfig, @Nullable android.net.NetworkProvider);
     method @Nullable public android.net.Network getNetwork();
     method public void markConnected();
     method public void onAddKeepalivePacketFilter(int, @NonNull android.net.KeepalivePacketData);
diff --git a/framework/src/android/net/NetworkAgent.java b/framework/src/android/net/NetworkAgent.java
index 3863ed1..05f8460 100644
--- a/framework/src/android/net/NetworkAgent.java
+++ b/framework/src/android/net/NetworkAgent.java
@@ -390,7 +390,6 @@
      * @param score the initial score of this network. Update with sendNetworkScore.
      * @param config an immutable {@link NetworkAgentConfig} for this agent.
      * @param provider the {@link NetworkProvider} managing this agent.
-     * @hide TODO : unhide when impl is complete
      */
     public NetworkAgent(@NonNull Context context, @NonNull Looper looper, @NonNull String logTag,
             @NonNull NetworkCapabilities nc, @NonNull LinkProperties lp,