Introduce a layering in the invalidation component as public and impl

components/invalidation/impl/sync_invalidation_listener.h

Index: components/invalidation/impl/sync_invalidation_listener.h
diff --git a/components/invalidation/sync_invalidation_listener.h b/components/invalidation/impl/sync_invalidation_listener.h
similarity index 91%
rename from components/invalidation/sync_invalidation_listener.h
rename to components/invalidation/impl/sync_invalidation_listener.h
index 37fa7f104757160a2b479439312f2ef635baaeda..697c1a72be1111ef09172ec23f49ab5ea8baf4f2 100644
--- a/components/invalidation/sync_invalidation_listener.h
+++ b/components/invalidation/impl/sync_invalidation_listener.h
@@ -5,8 +5,8 @@
 // A simple wrapper around invalidation::InvalidationClient that
 // handles all the startup/shutdown details and hookups.
 
-#ifndef COMPONENTS_INVALIDATION_SYNC_INVALIDATION_LISTENER_H_
-#define COMPONENTS_INVALIDATION_SYNC_INVALIDATION_LISTENER_H_
+#ifndef COMPONENTS_INVALIDATION_IMPL_SYNC_INVALIDATION_LISTENER_H_
+#define COMPONENTS_INVALIDATION_IMPL_SYNC_INVALIDATION_LISTENER_H_
 
 #include <string>
 
@@ -16,13 +16,13 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/non_thread_safe.h"
-#include "components/invalidation/ack_handler.h"
-#include "components/invalidation/invalidation_export.h"
-#include "components/invalidation/invalidation_state_tracker.h"
-#include "components/invalidation/invalidator_state.h"
-#include "components/invalidation/state_writer.h"
-#include "components/invalidation/sync_system_resources.h"
-#include "components/invalidation/unacked_invalidation_set.h"
+#include "components/invalidation/impl/invalidation_state_tracker.h"
+#include "components/invalidation/impl/state_writer.h"
+#include "components/invalidation/impl/sync_system_resources.h"
+#include "components/invalidation/impl/unacked_invalidation_set.h"
+#include "components/invalidation/public/ack_handler.h"
+#include "components/invalidation/public/invalidation_export.h"
+#include "components/invalidation/public/invalidator_state.h"
 #include "google/cacheinvalidation/include/invalidation-listener.h"
 
 namespace buzz {
@@ -189,4 +189,4 @@ class INVALIDATION_EXPORT_PRIVATE SyncInvalidationListener
 
 }  // namespace syncer
 
-#endif  // COMPONENTS_INVALIDATION_SYNC_INVALIDATION_LISTENER_H_
+#endif  // COMPONENTS_INVALIDATION_IMPL_SYNC_INVALIDATION_LISTENER_H_