Introduce a layering in the invalidation component as public and impl

components/invalidation/fake_invalidation_handler.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/fake_invalidation_handler.h"
-
-namespace syncer {
-
-FakeInvalidationHandler::FakeInvalidationHandler()
-    : state_(DEFAULT_INVALIDATION_ERROR),
-      invalidation_count_(0) {}
-
-FakeInvalidationHandler::~FakeInvalidationHandler() {}
-
-InvalidatorState FakeInvalidationHandler::GetInvalidatorState() const {
-  return state_;
-}
-
-const ObjectIdInvalidationMap&
-FakeInvalidationHandler::GetLastInvalidationMap() const {
-  return last_invalidation_map_;
-}
-
-int FakeInvalidationHandler::GetInvalidationCount() const {
-  return invalidation_count_;
-}
-
-void FakeInvalidationHandler::OnInvalidatorStateChange(InvalidatorState state) {
-  state_ = state;
-}
-
-void FakeInvalidationHandler::OnIncomingInvalidation(
-    const ObjectIdInvalidationMap& invalidation_map) {
-  last_invalidation_map_ = invalidation_map;
-  ++invalidation_count_;
-}
-
-std::string FakeInvalidationHandler::GetOwnerName() const { return "Fake"; }
-
-}  // namespace syncer