Add PAM session wrapper

remoting/host/BUILD.gn

Index: remoting/host/BUILD.gn
diff --git a/remoting/host/BUILD.gn b/remoting/host/BUILD.gn
index cbe014ed2f3de0b7d4971460c872c81376bbeb11..9caab30293b1d869a900cfd2c34f9db24e9c3b3a 100644
--- a/remoting/host/BUILD.gn
+++ b/remoting/host/BUILD.gn
@@ -1361,6 +1361,17 @@ if (enable_me2me_host) {
     }
 
     if (is_linux) {
+      executable("remoting_pam_session") {

[Jamie, 2016/09/09 18:27:11]

I think it would be better to name this according to what it does, not how it's
implemented. If it's something we expect primarily to be useful for starting the
host at boot, then perhaps something like remoting_boot_launcher; or since it's
primarily responsible for setting up the environment (in the generic, not the
Posix sense of the word), remoting_env_setup might be appropriate.

[rkjnsn, 2016/09/09 21:24:30]

remoting_user_session? I think the essence of what it does is start the me2me
script as the target user, doing whatever it needs to do to initialize a session
for that user.

[Jamie, 2016/09/12 20:36:51]

SGTM.

+        sources = [
+          "linux/remoting_pam_session.cc",
+        ]
+
+        deps = [
+          "//base",
+        ]
+
+        libs = [ "pam" ]
+      }
       copy("remoting_me2me_host_copy_script") {
         sources = [
           "linux/linux_me2me_host.py",