Add PAM session wrapper

remoting/host/linux/BUILD.gn

Index: remoting/host/linux/BUILD.gn
diff --git a/remoting/host/linux/BUILD.gn b/remoting/host/linux/BUILD.gn
index 0745dc5e5fdccb0837297ffb37c017da9d2b313c..bfdc1ab7605a3ae9e3eb181f2651542d5366aea9 100644
--- a/remoting/host/linux/BUILD.gn
+++ b/remoting/host/linux/BUILD.gn
@@ -9,6 +9,18 @@ group("all_tests") {
 }
 
 if (enable_me2me_host) {
+  executable("remoting_user_session") {
+    sources = [
+      "remoting_user_session.cc",
+    ]
+
+    deps = [
+      "//base",
+    ]
+
+    libs = [ "pam" ]
+  }
+
   copy("remoting_me2me_host_copy_script") {
     sources = [
       "linux_me2me_host.py",