metrics: Add random delays to perf collection

chrome/browser/metrics/perf_provider_chromeos.h

Index: chrome/browser/metrics/perf_provider_chromeos.h
diff --git a/chrome/browser/metrics/perf_provider_chromeos.h b/chrome/browser/metrics/perf_provider_chromeos.h
index 8f1ac2f830a0bef4d3fdb0055923a91ae695cc94..3f53ad922b21e47236e2d61b3ea08cefe5d156d5 100644
--- a/chrome/browser/metrics/perf_provider_chromeos.h
+++ b/chrome/browser/metrics/perf_provider_chromeos.h
@@ -85,6 +85,17 @@ class PerfProvider : public base::NonThreadSafe,
   // reschedules it to be collected again.
   void DoPeriodicCollection();
 
+  // Collects perf data after a resume. |sleep_duration| is the duration the
+  // system was suspended before resuming. |time_after_resume_ms| is how long
+  // ago the system resumed.
+  void CollectPerfDataAfterResume(const base::TimeDelta& sleep_duration,
+                                  const base::TimeDelta& time_after_resume);
+
+  // Collects perf data after a session restore. |time_after_restore| is how
+  // long ago the session restore started.
+  void CollectPerfDataAfterSessionRestore(
+      const base::TimeDelta& time_after_restore);
+
   // Parses a perf data protobuf from the |data| passed in only if the
   // |incognito_observer| indicates that no incognito window had been opened
   // during the profile collection period.
@@ -97,8 +108,14 @@ class PerfProvider : public base::NonThreadSafe,
   // Vector of SampledProfile protobufs containing perf profiles.
   std::vector<SampledProfile> cached_perf_data_;
 
-  // For scheduling collection of perf data.
-  base::OneShotTimer<PerfProvider> timer_;
+  // Timers for scheduling collection of perf data.
+
+  // Timer for interval-based collection.
+  base::OneShotTimer<PerfProvider> interval_timer_;
+  // Timer for collection on resume from suspend.
+  base::OneShotTimer<PerfProvider> resume_timer_;
+  // Timer for collection on restore session.
+  base::OneShotTimer<PerfProvider> restore_session_timer_;
 
   // For detecting when changes to the login state.
   LoginObserver login_observer_;