Allow MetricsProviders to request an initial stability log.

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 302 matching lines @@
   // Starts the process of uploading metrics data.
   void StartScheduledUpload();
 
   // Called by the client when final log info collection is complete.
   void OnFinalLogInfoCollectionDone();
 
   // Either closes the current log or creates and closes the initial log
   // (depending on |state_|), and stages it for upload.
   void StageNewLog();
 
+  // Returns true if any of the registered metrics providers have stability
+  // metrics to report.
+  bool ProvidersHaveStabilityMetrics();
+
   // 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.
   void PrepareInitialStabilityLog();
 
   // Prepares the initial metrics log, which includes startup histograms and
   // profiler data, as well as incremental stability-related metrics.
   void PrepareInitialMetricsLog();
 
@@ skipping 132 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(MetricsServiceTest, IsPluginProcess);
   FRIEND_TEST_ALL_PREFIXES(MetricsServiceTest, MetricsServiceObserver);
   FRIEND_TEST_ALL_PREFIXES(MetricsServiceTest,
                            PermutedEntropyCacheClearedWhenLowEntropyReset);
   FRIEND_TEST_ALL_PREFIXES(MetricsServiceTest, RegisterSyntheticTrial);
 
   DISALLOW_COPY_AND_ASSIGN(MetricsService);
 };
 
 #endif  // COMPONENTS_METRICS_METRICS_SERVICE_H_