Introduce a layering in the invalidation component as public and impl

components/invalidation/base/invalidation.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/invalidation.h"
+#include "components/invalidation/base/invalidation.h"
 
 #include <cstddef>
 
 #include "base/bind.h"
 #include "base/json/json_string_value_serializer.h"
 #include "base/location.h"
 #include "base/rand_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/values.h"
-#include "components/invalidation/ack_handler.h"
-#include "components/invalidation/invalidation_util.h"
+#include "components/invalidation/base/ack_handler.h"
+#include "components/invalidation/base/invalidation_util.h"
 
 namespace syncer {
 
 namespace {
 const char kObjectIdKey[] = "objectId";
 const char kIsUnknownVersionKey[] = "isUnknownVersion";
 const char kVersionKey[] = "version";
 const char kPayloadKey[] = "payload";
 const int64 kInvalidVersion = -1;
 }
@@ skipping 143 matching lines @@
                            const std::string& payload,
                            AckHandle ack_handle)
     : id_(id),
       is_unknown_version_(is_unknown_version),
       version_(version),
       payload_(payload),
       ack_handle_(ack_handle) {
 }
 
 }  // namespace syncer