Add PAM session wrapper

remoting/host/linux/BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//remoting/build/config/remoting_build.gni")
 
 group("all_tests") {
   testonly = true
 }
 
 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",
     ]
     outputs = [
       "$root_build_dir/remoting/chrome-remote-desktop",
     ]
   }
 
   copy("remoting_me2me_host_copy_host") {
@@ skipping 67 matching lines @@
     "//remoting/host/setup",
   ]
 
   # The |major|, |build| and |patch| versions are inherited from Chrome.
   # Since Chrome's |minor| version is always '0', we replace it with a
   # Chromoting-specific patch version.
   defines =
       [ "VERSION=" + "$chrome_version_major" + "." + "$remoting_version_patch" +
         "." + "$chrome_version_build" + "." + "$chrome_version_patch" ]
 }