Set flag to disallow non system window overlays to prevent tapjacking

Bug: 183609854
Test: manual
Change-Id: I4e63a98c875742ef0068d381d5fd4ec38c267768

packages/SystemUI/src/com/android/systemui/usb/UsbResolverActivity.java

@@ -33,6 +33,7 @@ import android.os.RemoteException;
 import android.os.ServiceManager;
 import android.os.UserHandle;
 import android.util.Log;
+import android.view.WindowManager;
 import android.widget.CheckBox;
 
 import com.android.internal.app.ResolverActivity;
@@ -60,6 +61,8 @@ public class UsbResolverActivity extends ResolverActivity {
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
+        getWindow().addSystemFlags(
+                WindowManager.LayoutParams.SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS);
         Intent intent = getIntent();
         Parcelable targetParcelable = intent.getParcelableExtra(Intent.EXTRA_INTENT);
         if (!(targetParcelable instanceof Intent)) {