Introduce a layering in the invalidation component as public and impl

components/invalidation/invalidation_logger_observer.h

-// 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.
-
-#ifndef COMPONENTS_INVALIDATION_INVALIDATION_LOGGER_OBSERVER_H_
-#define COMPONENTS_INVALIDATION_INVALIDATION_LOGGER_OBSERVER_H_
-
-#include "base/memory/scoped_ptr.h"
-#include "components/invalidation/invalidation_util.h"
-#include "components/invalidation/invalidator_state.h"
-#include "components/invalidation/object_id_invalidation_map.h"
-
-namespace base {
-class DictionaryValue;
-}  // namespace base
-
-namespace syncer {
-class InvalidationHandler;
-class ObjectIdInvalidationMap;
-}  // namespace syncer
-
-namespace invalidation {
-// This class provides the possibilty to register as an observer for the
-// InvalidationLogger notifications whenever an InvalidatorService changes
-// its internal state.
-// (i.e. A new registration, a new invalidation, a TICL/GCM state change)
-class InvalidationLoggerObserver {
- public:
-  virtual void OnRegistrationChange(
-      const std::multiset<std::string>& registered_handlers) = 0;
-  virtual void OnStateChange(const syncer::InvalidatorState& new_state,
-                             const base::Time& last_change_timestamp) = 0;
-  virtual void OnUpdateIds(const std::string& handler_name,
-                           const syncer::ObjectIdCountMap& details) = 0;
-  virtual void OnDebugMessage(const base::DictionaryValue& details) = 0;
-  virtual void OnInvalidation(
-      const syncer::ObjectIdInvalidationMap& details) = 0;
-  virtual void OnDetailedStatus(const base::DictionaryValue& details) = 0;
-
- protected:
-  virtual ~InvalidationLoggerObserver() {}
-};
-
-}  // namespace invalidation
-
-#endif  // COMPONENTS_INVALIDATION_INVALIDATION_LOGGER_OBSERVER_H_