Extend VariationParamsManager to support feature associations.

components/ntp_snippets/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.
 
 import("//build/config/ui.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
@@ skipping 133 matching lines @@
     "//components/offline_pages",
     "//components/offline_pages:test_support",
     "//components/physical_web/data_source:test_support",
     "//components/sessions",
     "//components/sessions:test_support",
     "//components/signin/core/browser:test_support",
     "//components/signin/core/common",
     "//components/strings",
     "//components/sync:test_support_driver",
     "//components/sync_sessions",
-    "//components/variations",
+    "//components/variations:test_support",
     "//net:test_support",
     "//testing/gtest",
     "//third_party/icu/",
     "//ui/gfx:test_support",
   ]
 }
 
 source_set("test_support") {
   testonly = true
   sources = [
     "mock_content_suggestions_provider_observer.cc",
     "mock_content_suggestions_provider_observer.h",
     "offline_pages/offline_pages_test_utils.cc",
     "offline_pages/offline_pages_test_utils.h",
   ]
 
   deps = [
     ":ntp_snippets",
     "//base",
     "//components/offline_pages",
     "//components/offline_pages:test_support",
     "//testing/gmock",
   ]
 }