Add variations params api to get params from features.

components/variations/variations_associated_data.cc

Index: components/variations/variations_associated_data.cc
diff --git a/components/variations/variations_associated_data.cc b/components/variations/variations_associated_data.cc
index 9a84a32fe64637789f227c36677e3ea92e7210eb..9aa51d379f3d884a094d208d621e0d4eaacbe7f8 100644
--- a/components/variations/variations_associated_data.cc
+++ b/components/variations/variations_associated_data.cc
@@ -8,6 +8,7 @@
 #include <utility>
 #include <vector>
 
+#include "base/feature_list.h"
 #include "base/macros.h"
 #include "base/memory/singleton.h"
 
@@ -212,6 +213,18 @@ bool GetVariationParams(const std::string& trial_name,
       trial_name, params);
 }
 
+bool GetVariationParamsByFeature(const base::Feature& feature,
+                                 std::map<std::string, std::string>* params) {
+  if (!base::FeatureList::IsEnabled(feature))
+    return false;
+
+  base::FieldTrial* trial = base::FeatureList::GetFieldTrial(feature);
+  if (!trial)
+    return false;
+
+  return GetVariationParams(trial->trial_name(), params);
+}
+
 std::string GetVariationParamValue(const std::string& trial_name,
                                    const std::string& param_name) {
   std::map<std::string, std::string> params;
@@ -223,6 +236,18 @@ std::string GetVariationParamValue(const std::string& trial_name,
   return std::string();
 }
 
+std::string GetVariationParamValueByFeature(const base::Feature& feature,
+                                            const std::string& param_name) {
+  if (!base::FeatureList::IsEnabled(feature))
+    return std::string();
+
+  base::FieldTrial* trial = base::FeatureList::GetFieldTrial(feature);
+  if (!trial)
+    return std::string();
+
+  return GetVariationParamValue(trial->trial_name(), param_name);
+}
+
 // Functions below are exposed for testing explicitly behind this namespace.
 // They simply wrap existing functions in this file.
 namespace testing {