Componentize PrefSyncableService and support classes.

components/syncable_prefs/BUILD.gn

+# Copyright 2015 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/features.gni")
+
+source_set("syncable_prefs") {
+  sources = [
+    "pref_model_associator.cc",
+    "pref_model_associator.h",
+    "pref_model_associator_client.h",
+    "pref_service_syncable.cc",
+    "pref_service_syncable.h",
+    "pref_service_syncable_factory.cc",
+    "pref_service_syncable_factory.h",
+    "pref_service_syncable_observer.h",
+    "synced_pref_change_registrar.cc",
+    "synced_pref_change_registrar.h",
+    "synced_pref_observer.h",
+  ]
+
+  deps = [
+    "//base",
+    "//base:prefs",
+    "//components/pref_registry",
+    "//sync",
+  ]
+
+  if (enable_configuration_policy) {
+    deps += [
+      "//components/policy:policy_component_browser",
+      "//components/policy:policy_component_common",
+    ]
+  }
+}
+
+source_set("test_support") {
+  testonly = true
+  sources = [
+    "pref_service_mock_factory.cc",
+    "pref_service_mock_factory.h",
+    "testing_pref_service_syncable.cc",
+    "testing_pref_service_syncable.h",
+  ]
+
+  deps = [
+    "//testing/gtest",
+    ":syncable_prefs",
+  ]
+}
+
+source_set("unit_tests") {
+  testonly = true
+  sources = [
+    "pref_model_associator_unittest.cc",
+    "pref_service_syncable_unittest.cc",
+  ]
+
+  deps = [
+    ":syncable_prefs",
+    ":test_support",
+    "//testing/gtest",
+    "//sync:test_support_sync_api",
+  ]
+}