Introduce a layering in the invalidation component as public and impl

components/invalidation/public/invalidation_service.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_SERVICE_H_
-#define COMPONENTS_INVALIDATION_INVALIDATION_SERVICE_H_
+#ifndef COMPONENTS_INVALIDATION_PUBLIC_INVALIDATION_SERVICE_H_
+#define COMPONENTS_INVALIDATION_PUBLIC_INVALIDATION_SERVICE_H_
 
 #include "base/callback_forward.h"
-#include "components/invalidation/invalidation_util.h"
-#include "components/invalidation/invalidator_state.h"
+#include "components/invalidation/public/invalidation_util.h"
+#include "components/invalidation/public/invalidator_state.h"
 
 class IdentityProvider;
 
 namespace syncer {
 class InvalidationHandler;
 }  // namespace syncer
 
 namespace invalidation {
 class InvalidationLogger;
 
@@ skipping 85 matching lines @@
   // Triggers requests of internal status.
   virtual void RequestDetailedStatus(
       base::Callback<void(const base::DictionaryValue&)> post_caller) const = 0;
 
   // Returns the identity provider.
   virtual IdentityProvider* GetIdentityProvider() = 0;
 };
 
 }  // namespace invalidation
 
-#endif  // COMPONENTS_INVALIDATION_INVALIDATION_SERVICE_H_
+#endif  // COMPONENTS_INVALIDATION_PUBLIC_INVALIDATION_SERVICE_H_