[Variations] Refactor all state used for study filtering into a container struct.

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 = [
     "active_field_trials.cc",
     "active_field_trials.h",
     "android/component_jni_registrar.cc",
     "android/component_jni_registrar.h",
     "android/variations_associated_data_android.cc",
     "android/variations_associated_data_android.h",
     "android/variations_seed_bridge.cc",
     "android/variations_seed_bridge.h",
     "caching_permuted_entropy_provider.cc",
     "caching_permuted_entropy_provider.h",
     "child_process_field_trial_syncer.cc",
     "child_process_field_trial_syncer.h",
+    "client_filterable_state.cc",
+    "client_filterable_state.h",
     "entropy_provider.cc",
     "entropy_provider.h",
     "experiment_labels.cc",
     "experiment_labels.h",
     "metrics_util.cc",
     "metrics_util.h",
     "pref_names.cc",
     "pref_names.h",
     "processed_study.cc",
     "processed_study.h",
@@ skipping 103 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/google:compression_utils",
   ]
 }