sync: Inject sync/'s dependency on invalidations

sync/test/mock_invalidation.h

Index: sync/test/mock_invalidation.h
diff --git a/sync/test/mock_invalidation.h b/sync/test/mock_invalidation.h
new file mode 100644
index 0000000000000000000000000000000000000000..808f02c09216c9e650e1c5beb190075bda55f12d
--- /dev/null
+++ b/sync/test/mock_invalidation.h
@@ -0,0 +1,48 @@
+// 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_MOCK_INVALIDATION_H_
+#define SYNC_TEST_MOCK_INVALIDATION_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "sync/internal_api/public/base/invalidation_interface.h"
+
+namespace syncer {
+
+// An InvalidationInterface used by sync for testing.
+// It does not support any form of acknowledgements.
+class MockInvalidation : public InvalidationInterface {
+ public:
+  // Helpers to build new MockInvalidations.
+  static scoped_ptr<MockInvalidation> BuildUnknownVersion();
+  static scoped_ptr<MockInvalidation> Build(int64 version,
+                                            const std::string& payload);
+
+  virtual ~MockInvalidation();
+
+  // Implementation of InvalidationInterface.
+  virtual bool IsUnknownVersion() const OVERRIDE;
+  virtual const std::string& GetPayload() const OVERRIDE;
+  virtual int64 GetVersion() const OVERRIDE;
+  virtual void Acknowledge() OVERRIDE;
+  virtual void Drop() OVERRIDE;
+
+ protected:
+  MockInvalidation(bool is_unknown_version,
+                   int64 version,
+                   const std::string& payload);
+
+  // Whether or not this is an 'unknown version' invalidation.
+  const bool is_unknown_version_;
+
+  // The version of this invalidation.  Valid only if !is_unknown_version_.
+  const int64 version_;
+
+  // The payload of this invalidation.  Valid only if !is_unknown_version_.
+  const std::string payload_;
+};
+
+}  // namespace syncer
+
+#endif  // SYNC_TEST_MOCK_INVALIDATION_H_