Comments updated as result of infinite timeout for state keys generated

chromeos/dbus/session_manager_client.h

 // Copyright (c) 2012 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_DBUS_SESSION_MANAGER_CLIENT_H_
 #define CHROMEOS_DBUS_SESSION_MANAGER_CLIENT_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 193 matching lines @@
 
   using StateKeysCallback =
       base::Callback<void(const std::vector<std::string>& state_keys)>;
 
   // Get the currently valid server-backed state keys for the device.
   // Server-backed state keys are opaque, device-unique, time-dependent,
   // client-determined identifiers that are used for keying state in the cloud
   // for the device to retrieve after a device factory reset.
   //
   // The state keys are returned asynchronously via |callback|. The callback
-  // will be invoked with an empty state key vector in case of errors.
+  // is invoked with an empty state key vector in case of errors. If the time
+  // sync fails or there's no network, the callback is never invoked.
   virtual void GetServerBackedStateKeys(const StateKeysCallback& callback) = 0;
 
   // Used for several ARC methods.  Takes a boolean indicating whether the
   // operation was successful or not.
   using ArcCallback = base::Callback<void(bool success)>;
 
   // Used for GetArcStartTime. Takes a boolean indicating whether the
   // operation was successful or not and the ticks of ARC start time if it
   // is successful.
   using GetArcStartTimeCallback =
@@ skipping 57 matching lines @@
   // Create() should be used instead.
   SessionManagerClient();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SessionManagerClient);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_SESSION_MANAGER_CLIENT_H_