Adding a flag for enabling directWifiManger instead of using

PeerConnectionFactory to break off the dependency.

- This is required so that Android app that doesn't use the
  peerconnection_java as dependency can include android monitor
  directly without incurring size bloat.

Bug: None
Change-Id: I7b3453f268467550c0a4b3a0bbf858d55d2fd8a4
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/229322
Reviewed-by: Jonas Oreland <jonaso@webrtc.org>
Reviewed-by: Sergey Silkin <ssilkin@webrtc.org>
Commit-Queue: Tim Na <natim@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#34829}

sdk/android/api/org/webrtc/NetworkMonitorAutoDetect.java

@@ -565,6 +565,7 @@ public class NetworkMonitorAutoDetect extends BroadcastReceiver implements Netwo
   private ConnectivityManagerDelegate connectivityManagerDelegate;
   private WifiManagerDelegate wifiManagerDelegate;
   private WifiDirectManagerDelegate wifiDirectManagerDelegate;
+  private static boolean includeWifiDirect;
 
   private boolean isRegistered;
   private NetworkChangeDetector.ConnectionType connectionType;
@@ -583,7 +584,8 @@ public class NetworkMonitorAutoDetect extends BroadcastReceiver implements Netwo
     wifiSSID = getWifiSSID(networkState);
     intentFilter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
 
-    if (PeerConnectionFactory.fieldTrialsFindFullName("IncludeWifiDirect").equals("Enabled")) {
+    if (PeerConnectionFactory.fieldTrialsFindFullName("IncludeWifiDirect").equals("Enabled")
+        || includeWifiDirect) {
       wifiDirectManagerDelegate = new WifiDirectManagerDelegate(observer, context);
     }
 
@@ -607,6 +609,11 @@ public class NetworkMonitorAutoDetect extends BroadcastReceiver implements Netwo
     }
   }
 
+  /** Enables WifiDirectManager. */
+  public static void setIncludeWifiDirect(boolean enable) {
+    includeWifiDirect = enable;
+  }
+
   @Override
   public boolean supportNetworkCallback() {
     return connectivityManagerDelegate.supportNetworkCallback();