Quantify initial stability report edge cases.

components/metrics/metrics_service.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.
 
 // This file defines a service that collects information about the user
 // experience in order to help improve future versions of the app.
 
 #ifndef COMPONENTS_METRICS_METRICS_SERVICE_H_
 #define COMPONENTS_METRICS_METRICS_SERVICE_H_
 
@@ skipping 334 matching lines @@
   // the log manager, staging it if necessary.
   void SendNextLog();
 
   // Returns true if any of the registered metrics providers have critical
   // stability metrics to report in an initial stability log.
   bool ProvidersHaveInitialStabilityMetrics();
 
   // Prepares the initial stability log, which is only logged when the previous
   // run of Chrome crashed.  This log contains any stability metrics left over
   // from that previous run, and only these stability metrics.  It uses the
-  // system profile from the previous session.  Returns true if a log was
-  // created.
-  bool PrepareInitialStabilityLog();
+  // system profile from the previous session.  |prefs_previous_version| is used
+  // to validate the version number recovered from the system profile.  Returns
+  // true if a log was created.
+  bool PrepareInitialStabilityLog(const std::string& prefs_previous_version);
 
   // Prepares the initial metrics log, which includes startup histograms and
   // profiler data, as well as incremental stability-related metrics.
   void PrepareInitialMetricsLog();
 
   // Uploads the currently staged log (which must be non-null).
   void SendStagedLog();
 
   // Called after transmission completes (either successfully or with failure).
   void OnLogUploadComplete(int response_code);
@@ skipping 139 matching lines @@
   // Weak pointers factory used for saving state. All weak pointers managed by
   // this factory are invalidated in ScheduleNextStateSave.
   base::WeakPtrFactory<MetricsService> state_saver_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MetricsService);
 };
 
 }  // namespace metrics
 
 #endif  // COMPONENTS_METRICS_METRICS_SERVICE_H_