Introduce a layering in the invalidation component as public and impl

components/invalidation/invalidator_test_template.cc

-// 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.
-
-#include "components/invalidation/invalidator_test_template.h"
-
-namespace syncer {
-namespace internal {
-
-BoundFakeInvalidationHandler::BoundFakeInvalidationHandler(
-    const Invalidator& invalidator)
-    : invalidator_(invalidator),
-      last_retrieved_state_(DEFAULT_INVALIDATION_ERROR) {}
-
-BoundFakeInvalidationHandler::~BoundFakeInvalidationHandler() {}
-
-InvalidatorState BoundFakeInvalidationHandler::GetLastRetrievedState() const {
-  return last_retrieved_state_;
-}
-
-void BoundFakeInvalidationHandler::OnInvalidatorStateChange(
-    InvalidatorState state) {
-  FakeInvalidationHandler::OnInvalidatorStateChange(state);
-  last_retrieved_state_ = invalidator_.GetInvalidatorState();
-}
-
-}  // namespace internal
-}  // namespace syncer