sync: Inject sync/'s dependency on invalidations

sync/notifier/dropped_invalidation_tracker.cc

-// Copyright 2013 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 "sync/notifier/dropped_invalidation_tracker.h"
-
-#include "sync/internal_api/public/base/invalidation.h"
-
-namespace syncer {
-
-DroppedInvalidationTracker::DroppedInvalidationTracker(
-    const invalidation::ObjectId& id)
-    : id_(id),
-      drop_ack_handle_(AckHandle::InvalidAckHandle()),
-      recovering_from_drop_(false) {}
-
-DroppedInvalidationTracker::~DroppedInvalidationTracker() {}
-
-const invalidation::ObjectId& DroppedInvalidationTracker::object_id() const {
-  return id_;
-}
-
-void DroppedInvalidationTracker::RecordDropEvent(
-    WeakHandle<AckHandler> handler, AckHandle handle) {
-  drop_ack_handler_ = handler;
-  drop_ack_handle_ = handle;
-  recovering_from_drop_ = true;
-}
-
-void DroppedInvalidationTracker::RecordRecoveryFromDropEvent() {
-  if (drop_ack_handler_.IsInitialized()) {
-    drop_ack_handler_.Call(FROM_HERE,
-                           &AckHandler::Acknowledge,
-                           id_,
-                           drop_ack_handle_);
-  }
-  drop_ack_handler_ = syncer::WeakHandle<AckHandler>();
-  recovering_from_drop_ = false;
-}
-
-bool DroppedInvalidationTracker::IsRecoveringFromDropEvent() const {
-  return recovering_from_drop_;
-}
-
-}  // namespace syncer