Expand FeatureList to support FieldTrial association.

components/variations/service/variations_service.cc

Index: components/variations/service/variations_service.cc
diff --git a/components/variations/service/variations_service.cc b/components/variations/service/variations_service.cc
index bdc3e2a2951a4ba6d79fa181d209ec9524397a59..1ccfc104d2352562a363517bedfe42f97ae40a45 100644
--- a/components/variations/service/variations_service.cc
+++ b/components/variations/service/variations_service.cc
@@ -221,7 +221,7 @@ VariationsService::VariationsService(
 VariationsService::~VariationsService() {
 }
 
-bool VariationsService::CreateTrialsFromSeed() {
+bool VariationsService::CreateTrialsFromSeed(base::FeatureList* feature_list) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   create_trials_from_seed_called_ = true;
@@ -248,7 +248,8 @@ bool VariationsService::CreateTrialsFromSeed() {
       GetCurrentFormFactor(), GetHardwareClass(), latest_country,
       LoadPermanentConsistencyCountry(current_version, latest_country),
       base::Bind(&VariationsServiceClient::OverrideUIString,
-                 base::Unretained(client_.get())));
+                 base::Unretained(client_.get())),
+      feature_list);
 
   const base::Time now = base::Time::Now();