Enable system NSS key slot.

net/cert/nss_cert_database_chromeos.h

Index: net/cert/nss_cert_database_chromeos.h
diff --git a/net/cert/nss_cert_database_chromeos.h b/net/cert/nss_cert_database_chromeos.h
index b68f742b5183f9e62798a015de1e76452d625302..ef831294e7300b0f1bf58c4dc928380ed5c9ee1b 100644
--- a/net/cert/nss_cert_database_chromeos.h
+++ b/net/cert/nss_cert_database_chromeos.h
@@ -16,16 +16,23 @@ namespace net {
 
 class NET_EXPORT NSSCertDatabaseChromeOS : public NSSCertDatabase {
  public:
+  // |public_slot| is the NSS software slot for the user.

[Ryan Sleevi, 2014/07/29 23:53:15]

Comment wise, I think the older bits were more correct.

In particular, there should be no assumption that |public_slot| is a software
slot. In the future, it will be a Chaps slot just the same.

It's just the place to store the public details.

[pneubeck (no reviews), 2014/07/30 06:27:39]

Actually, this comment should be unnecessary as the arguments are forwarded to
NSSCertDatabase?
With 'older bits' you probably mean the c'tor comment on NSSCertDatabase.

[Ryan Sleevi, 2014/07/30 06:45:30]

Yeah.

Either way, the comment is wrong as is. We shouldn't assume software.

[pneubeck (no reviews), 2014/07/30 13:54:10]

Removed.

+  // |private_slot| is the TPM slot for the user (if a TPM is present).
   NSSCertDatabaseChromeOS(crypto::ScopedPK11Slot public_slot,
                           crypto::ScopedPK11Slot private_slot);
   virtual ~NSSCertDatabaseChromeOS();
 
+  // |system_slot| is the system TPM slot, which is only enabled for certain
+  // users.
+  void SetSystemSlot(crypto::ScopedPK11Slot system_slot);
+
   // NSSCertDatabase implementation.
   virtual void ListCertsSync(CertificateList* certs) OVERRIDE;
   virtual void ListCerts(const NSSCertDatabase::ListCertsCallback& callback)
       OVERRIDE;
   virtual void ListModules(CryptoModuleList* modules, bool need_rw) const
       OVERRIDE;
+  virtual crypto::ScopedPK11Slot GetSystemSlot() const OVERRIDE;
 
   // TODO(mattm): handle trust setting, deletion, etc correctly when certs exist
   // in multiple slots.
@@ -40,6 +47,7 @@ class NET_EXPORT NSSCertDatabaseChromeOS : public NSSCertDatabase {
                             CertificateList* certs);
 
   NSSProfileFilterChromeOS profile_filter_;
+  crypto::ScopedPK11Slot system_slot_;
 
   DISALLOW_COPY_AND_ASSIGN(NSSCertDatabaseChromeOS);
 };