sync: Support nudges from non-blocking sync types

sync/test/engine/mock_nudge_handler.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 SYNC_TEST_ENGINE_MOCK_NUDGE_HANDLER_H_
+#define SYNC_TEST_ENGINE_MOCK_NUDGE_HANDLER_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "sync/engine/nudge_handler.h"
+#include "sync/internal_api/public/base/model_type.h"
+
+namespace syncer {
+
+class MockNudgeHandler : public NudgeHandler {
+ public:
+  MockNudgeHandler();
+  virtual ~MockNudgeHandler();
+
+  virtual void NudgeForInitialDownload(syncer::ModelType type) OVERRIDE;
+  virtual void NudgeForCommit(syncer::ModelType type) OVERRIDE;
+  virtual void NudgeForRefresh(syncer::ModelType type) OVERRIDE;
+
+  int GetNumInitialDownloadNudges() const;
+  int GetNumCommitNudges() const;
+  int GetNumRefreshNudges() const;
+
+  void ClearCounters();
+
+ private:
+  int num_initial_nudges_;
+  int num_commit_nudges_;
+  int num_refresh_nudges_;
+
+  DISALLOW_COPY_AND_ASSIGN(MockNudgeHandler);
+};
+
+}  // namespace syncer
+
+#endif  // SYNC_TEST_ENGINE_MOCK_NUDGE_HANDLER_H_