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 a0600754d5bbddbcdfdc38ae6995e5e3e9248ee4..0ccfdde4b6cd783c6eba9bb37801e88e9f132bbc 100644
--- a/chrome/browser/chrome_browser_main.cc
+++ b/chrome/browser/chrome_browser_main.cc
@@ -907,8 +907,14 @@ void ChromeBrowserMainParts::SetupMetricsAndFieldTrials() {
 
   variations::VariationsService* variations_service =
       browser_process_->variations_service();
-  if (variations_service)
-    variations_service->CreateTrialsFromSeed(feature_list.get());
+  bool was_a_seed_applied = false;
+  if (variations_service) {
+    was_a_seed_applied =
+        variations_service->CreateTrialsFromSeed(feature_list.get());
+  }
+
+  browser_field_trials_.SetupFeatureControllingFieldTrials(was_a_seed_applied,
+                                                           feature_list.get());
 
   base::FeatureList::SetInstance(std::move(feature_list));