Send metrics with embedded system profiles after system startup.

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 335 matching lines @@
   void RecordCurrentEnvironment(MetricsLog* log);
 
   // Record complete list of histograms into the current log.
   // Called when we close a log.
   void RecordCurrentHistograms();
 
   // Record complete list of stability histograms into the current log,
   // i.e., histograms with the |kUmaStabilityHistogramFlag| flag set.
   void RecordCurrentStabilityHistograms();
 
+  // Record a single independent profile and assocatied histogram from
+  // metrics providers. If this returns true, one was found and there may
+  // be more.
+  bool RecordIndependentHistogramLog();

[Alexei Svitkine (slow), 2017/06/08 23:59:31]

Nit: I find the names not very clear. First, I suggest using the "Prepare"
terminology to match PrepareInitialStabilityLog(). "Record" is usually used when
we record metrics (i.e. functions that have histogram macros in them).

Also, I think mentioning that this is from the providers in the name would be
good. e.g. PrepareProviderMetricsLog().

[bcwhite, 2017/06/09 15:09:27]

Done.

+
+  // Records one independent histogram log and then reschedules itself to
+  // check for others. The interval is so as to not adversely impact the UI.
+  void RecordIndependentHistogramJob();

[Alexei Svitkine (slow), 2017/06/08 23:59:31]

Nit: Job -> Task, so with the above suggestion PrepareProviderMetricsLogTask().

[bcwhite, 2017/06/09 15:09:27]

Done.

+
   // Sub-service for uploading logs.
   MetricsReportingService reporting_service_;
 
   // Manager for the various in-flight logs.
   MetricsLogManager log_manager_;
 
   // |histogram_snapshot_manager_| prepares histogram deltas for transmission.
   base::HistogramSnapshotManager histogram_snapshot_manager_;
 
   // Used to manage various metrics reporting state prefs, such as client id,
@@ skipping 72 matching lines @@
   // Weak pointers factory used to post task on different threads. All weak
   // pointers managed by this factory have the same lifetime as MetricsService.
   base::WeakPtrFactory<MetricsService> self_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MetricsService);
 };
 
 }  // namespace metrics
 
 #endif  // COMPONENTS_METRICS_METRICS_SERVICE_H_