[Sync] Rework unit tests for ChromeInvalidationClient

sync/notifier/fake_invalidation_state_tracker.h

+// Copyright (c) 2012 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_NOTIFIER_FAKE_INVALIDATION_STATE_TRACKER_H_
+#define SYNC_NOTIFIER_FAKE_INVALIDATION_STATE_TRACKER_H_
+
+#include "base/memory/weak_ptr.h"
+#include "sync/notifier/invalidation_state_tracker.h"
+
+namespace syncer {
+
+// InvalidationStateTracker implementation that simply keeps track of
+// the max versions and invalidation state in memory.
+class FakeInvalidationStateTracker
+    : public InvalidationStateTracker,
+      public base::SupportsWeakPtr<FakeInvalidationStateTracker> {
+ public:
+  FakeInvalidationStateTracker();
+  virtual ~FakeInvalidationStateTracker();
+
+  // InvalidationStateTracker implementation.
+  virtual InvalidationVersionMap GetAllMaxVersions() const OVERRIDE;
+  virtual void SetMaxVersion(const invalidation::ObjectId& id,
+                             int64 max_version) OVERRIDE;
+  int64 GetMaxVersion(const invalidation::ObjectId& id) const;
+  virtual void SetInvalidationState(const std::string& state) OVERRIDE;
+  virtual std::string GetInvalidationState() const OVERRIDE;
+
+  static const int64 kMinVersion;
+
+ private:
+  InvalidationVersionMap versions_;
+  std::string state_;
+};
+
+}  // namespace syncer
+
+#endif  // SYNC_NOTIFIER_FAKE_INVALIDATION_STATE_TRACKER_H_