Introduce a layering in the invalidation component as public and impl

components/invalidation/base/invalidation_util.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_util.h"
+#include "components/invalidation/base/invalidation_util.h"
 
 #include <ostream>
 #include <sstream>
 
 #include "base/json/json_writer.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/values.h"
-#include "components/invalidation/invalidation.h"
+#include "components/invalidation/base/invalidation.h"
 #include "google/cacheinvalidation/include/types.h"
 #include "google/cacheinvalidation/types.pb.h"
 
 namespace syncer {
 
 bool ObjectIdLessThan::operator()(const invalidation::ObjectId& lhs,
                                   const invalidation::ObjectId& rhs) const {
   return (lhs.source() < rhs.source()) ||
          (lhs.source() == rhs.source() && lhs.name() < rhs.name());
 }
@@ skipping 36 matching lines @@
   return true;
 }
 
 std::string ObjectIdToString(const invalidation::ObjectId& object_id) {
   std::string str;
   base::JSONWriter::Write(*ObjectIdToValue(object_id), &str);
   return str;
 }
 
 }  // namespace syncer