Extend VariationParamsManager to support feature associations.

components/variations/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
 static_library("variations") {
   sources = [
@@ skipping 73 matching lines @@
 if (is_android) {
   generate_jni("jni") {
     sources = [
       "android/java/src/org/chromium/components/variations/VariationsAssociatedData.java",
       "android/java/src/org/chromium/components/variations/firstrun/VariationsSeedBridge.java",
     ]
     jni_package = "variations"
   }
 }
 
+static_library("test_support") {
+  testonly = true
+  sources = [
+    "variations_params_manager.cc",
+    "variations_params_manager.h",
+  ]
+
+  public_deps = [
+    ":variations",
+  ]
+
+  deps = [
+    "//base/test:test_support",
+  ]
+}
+
 source_set("unit_tests") {
   testonly = true
   sources = [
     "active_field_trials_unittest.cc",
     "caching_permuted_entropy_provider_unittest.cc",
     "entropy_provider_unittest.cc",
     "experiment_labels_unittest.cc",
     "metrics_util_unittest.cc",
     "net/variations_http_headers_unittest.cc",
     "study_filtering_unittest.cc",
@@ skipping 13 matching lines @@
     ":variations",
     "net",
     "proto",
     "//base/test:test_support",
     "//components/prefs:test_support",
     "//components/variations/field_trial_config:unit_tests",
     "//testing/gtest",
     "//third_party/zlib:compression_utils",
   ]
 }