Add multi_profile_user_count field to system_profile proto.

chrome/browser/metrics/metrics_log.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.
 
 // This file defines a set of user experience metrics data recorded by
 // the MetricsService.  This is the unit of data that is sent to the server.
 
 #ifndef CHROME_BROWSER_METRICS_METRICS_LOG_H_
 #define CHROME_BROWSER_METRICS_METRICS_LOG_H_
 
@@ skipping 171 matching lines @@
 
   // Writes info about paired Bluetooth devices on this system.
   // This is a no-op if called on a non-Chrome OS platform.
   void WriteBluetoothProto(metrics::SystemProfileProto::Hardware* hardware);
 
   // Observes network state to provide values for SystemProfile::Network.
   MetricsNetworkObserver network_observer_;
 
 #if defined(OS_CHROMEOS)
   metrics::PerfProvider perf_provider_;
+
+  // The number of users in the multiprofile session
+  // when the log is first opened.

[Ilya Sherman, 2013/09/30 23:42:52]

nit: Please wrap this to 80-col.

+  int initial_multi_profile_user_count_;

[Ilya Sherman, 2013/09/30 23:42:52]

nit: const?

[Ilya Sherman, 2013/09/30 23:42:52]

Why not store this directly in the protocol buffer, and then reset it if need
be?

[Tim Song, 2013/10/05 01:25:23]

This would probably be cleaner. I'll remove this member variable.

 #endif
 
   // Bluetooth Adapter instance for collecting information about paired devices.
   scoped_refptr<device::BluetoothAdapter> adapter_;
 
   DISALLOW_COPY_AND_ASSIGN(MetricsLog);
 };
 
 #endif  // CHROME_BROWSER_METRICS_METRICS_LOG_H_