Adding local field trial for metrics/crash reports sampling.

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 adc1045e14c3a1dbb54927da2a17b6d4026c00a1..6f595cd18139d710f5b962b289cd15091738bc7e 100644
--- a/chrome/browser/chrome_browser_main.cc
+++ b/chrome/browser/chrome_browser_main.cc
@@ -907,8 +907,12 @@ void ChromeBrowserMainParts::SetupMetricsAndFieldTrials() {
 
   variations::VariationsService* variations_service =
       browser_process_->variations_service();
-  if (variations_service)
-    variations_service->CreateTrialsFromSeed(feature_list.get());
+
+  bool has_seed = variations_service &&
+                  variations_service->CreateTrialsFromSeed(feature_list.get());
+
+  browser_field_trials_.SetupFeatureControllingFieldTrials(has_seed,
+                                                           feature_list.get());
 
   base::FeatureList::SetInstance(std::move(feature_list));