Update TPMTokenLoader class comment.

chromeos/tpm_token_loader.h

 // Copyright 2014 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.
 
 #ifndef CHROMEOS_TPM_TOKEN_LOADER_H_
 #define CHROMEOS_TPM_TOKEN_LOADER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/threading/thread_checker.h"
 #include "base/time/time.h"
 #include "chromeos/chromeos_export.h"
 #include "chromeos/dbus/dbus_method_call_status.h"
 #include "chromeos/login/login_state.h"
 
 namespace base {
 class SequencedTaskRunner;
 }
 
 namespace chromeos {
 
-// This class is responsible for loading the TPM token when the user logs
-// in. It is expected to be constructed on the UI thread and public methods
-// should all be called from the UI thread. When the TPM token is loaded,
-// or if the TPM should stay disabled for the session, the observers are
+// This class is responsible for loading the TPM backed system token when the

[mattm, 2014/07/10 22:06:25]

nit: "TPM backed token and system slot"

+// user logs in. It is expected to be constructed on the UI thread and public
+// methods should all be called from the UI thread. When the TPM token is
+// loaded, or if the TPM should stay disabled for the session, the observers are
 // notified using |OnTPMTokenReady|.
+// Note: This currently loads the hard coded default slot with id 0. See
+// CryptohomeClient.

[mattm, 2014/07/10 22:06:25]

nit: Maybe be more precise like "See CryptohomeClient::OnPkcs11GetTpmTokenInfo."
?

 class CHROMEOS_EXPORT TPMTokenLoader : public LoginState::Observer {
  public:
   class Observer {
    public:
     // Called when the TPM token initialization is done or the case where TPM
     // should stay disabled is detected (e.g. on guest login).
     virtual void OnTPMTokenReady() = 0;
 
    protected:
     virtual ~Observer() {}
@@ skipping 94 matching lines @@
   scoped_refptr<base::SequencedTaskRunner> crypto_task_runner_;
 
   base::WeakPtrFactory<TPMTokenLoader> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TPMTokenLoader);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_TPM_TOKEN_LOADER_H_