sync: Support nudges from non-blocking sync types

sync/test/engine/mock_nudge_handler.h

Index: sync/test/engine/mock_nudge_handler.h
diff --git a/sync/test/engine/mock_nudge_handler.h b/sync/test/engine/mock_nudge_handler.h
new file mode 100644
index 0000000000000000000000000000000000000000..bbde8ed0e42083a5f5dc9c7eb4210810a71374ca
--- /dev/null
+++ b/sync/test/engine/mock_nudge_handler.h
@@ -0,0 +1,40 @@
+// 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;

[stanisc, 2014/07/09 22:35:25]

I didn't see any usage of the refresh counter. Are you planning to use it in a
later change?

[rlarocque, 2014/07/10 00:12:29]

That's the plan.

A refresh nudge is some type-specific event.  For example, we issue one for
SESSIONS when the user opens the new tab page on Android.

We don't have any interface to expose this functionality to the non-blocking
data types, so we can't test it yet.

+
+  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_