move enable_localaccount.sh, make pam_offline use it

src/platform/pam_offline/username_password.h

 // Copyright (c) 2009-2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // UsernamePassword wraps a username/password pair that can be used to
 // authenticate a user.
 
 #ifndef PAM_OFFLINE_USERNAME_PASSWORD_H_
 #define PAM_OFFLINE_USERNAME_PASSWORD_H_
 
 #include "pam_offline/credentials.h"
 
 #include <string.h>
 
 #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 {
  public:
   UsernamePassword(const char *username, const int username_length,
                    const char *password, const int password_length);
   ~UsernamePassword();
 
   // From credentials.h...
   void GetFullUsername(char *name_buffer, int length) const;
   void GetPartialUsername(char *name_buffer, int length) const;
   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_.
   UsernamePassword(const char *username, const int username_length,
                    const char *password, const int password_length,
                    bool dont_free_memory);
 
   void Init(const char *username, const int username_length,
             const char *password, const int password_length);
 
@@ skipping 17 matching lines @@
 
   FRIEND_TEST(UsernamePasswordTest, MemoryZeroTest);
   FRIEND_TEST(UsernamePasswordFetcherTest, FetchTest);
 
   DISALLOW_COPY_AND_ASSIGN(UsernamePassword);
 };
 
 }  // namespace pam_offline
 
 #endif  // PAM_OFFLINE_USERNAME_PASSWORD_H_