Resetting metrics ids on clump detection.

chrome/browser/chrome_browser_main.cc

Index: chrome/browser/chrome_browser_main.cc
diff --git a/chrome/browser/chrome_browser_main.cc b/chrome/browser/chrome_browser_main.cc
index b71cd5131bd93debb20a904339fc24ab7f062b7b..be62ac5235f3d7a422a9df8fc8356054ebc56fb6 100644
--- a/chrome/browser/chrome_browser_main.cc
+++ b/chrome/browser/chrome_browser_main.cc
@@ -578,6 +578,10 @@ void ChromeBrowserMainParts::SetupMetricsAndFieldTrials() {
   // Initialize FieldTrialList to support FieldTrials that use one-time
   // randomization.
   MetricsService* metrics = browser_process_->metrics_service();
+
+  if (local_state_->GetBoolean(prefs::kMetricsCloneDetected))
+    metrics->ResetVariationsState();

[Alexei Svitkine (slow), 2014/03/26 21:34:50]

Hmm, I'd actually prefer that the logic be entirely in MetricsService.

Maybe we can make the new function do the pref check itself and then call it
from both ForceClientIdCreation() and GetLowEntropySource().

[jwd, 2014/03/28 16:23:49]

Done.

+
   MetricsService::ReportingState reporting_state =
       IsMetricsReportingEnabled() ? MetricsService::REPORTING_ENABLED :
                                     MetricsService::REPORTING_DISABLED;