move enable_localaccount.sh, make pam_offline use it

src/platform/pam_offline/username_password.h

Index: src/platform/pam_offline/username_password.h
diff --git a/src/platform/pam_offline/username_password.h b/src/platform/pam_offline/username_password.h
index b2473d4d5e8c2737146a9a0c8a8fadc695426da7..d8152699920f212cd109a8e2d68b7c90e2f64905 100644
--- a/src/platform/pam_offline/username_password.h
+++ b/src/platform/pam_offline/username_password.h
@@ -15,6 +15,11 @@
 #include "base/basictypes.h"
 #include "gtest/gtest.h"
 
+// Enable local account only if user has specifically requested it
+#ifdef CHROMEOS_PAM_LOCALACCOUNT
+#include "pam_offline/pam_localaccount.h"
+#endif
+
 namespace pam_offline {
 
 class UsernamePassword : public Credentials {
@@ -29,6 +34,11 @@ class UsernamePassword : public Credentials {
   std::string GetObfuscatedUsername(const Blob &system_salt) const;
   std::string GetPasswordWeakHash(const Blob &system_salt) const;
 
+#ifdef CHROMEOS_PAM_LOCALACCOUNT
+  // returns true if username_ is the local account (if set up)
+  bool IsLocalAccount() const;
+#endif
+
  private:
   // ONLY FOR TESTING.  Allows the caller to tell us not to free the
   // memory we allocate for username_ and password_.