sync: Add helper class for P2P invalidations

chrome/browser/sync/test/integration/p2p_invalidation_forwarder.h

+// 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.
+
+#ifndef CHROME_BROWSER_SYNC_TEST_INTEGRATION_P2P_INVALIDATION_FORWARDER_H_
+#define CHROME_BROWSER_SYNC_TEST_INTEGRATION_P2P_INVALIDATION_FORWARDER_H_
+
+#include "base/compiler_specific.h"
+#include "chrome/browser/sync/profile_sync_service_observer.h"
+
+class ProfileSyncService;
+
+namespace invalidation {
+class P2PInvalidationService;
+};
+
+// This class links the ProfileSyncService to a P2PInvalidationService.
+//
+// It will observe ProfileSyncService events and emit invalidation events for
+// any committed changes in observes.
+//
+// It register and unregisters in its constructor and destructor.  This is
+// intended to make it easy to manage with a scoped_ptr.
+class P2PInvalidationForwarder : public ProfileSyncServiceObserver {
+ public:
+  P2PInvalidationForwarder(
+      ProfileSyncService* sync_service,
+      invalidation::P2PInvalidationService* invalidation_service);
+  virtual ~P2PInvalidationForwarder();
+
+  // Implementation of ProfileSyncServiceObserver
+  virtual void OnStateChanged() OVERRIDE;
+  virtual void OnSyncCycleCompleted() OVERRIDE;
+
+ private:
+  ProfileSyncService* sync_service_;
+  invalidation::P2PInvalidationService* invalidation_service_;
+};
+
+#endif  // CHROME_BROWSER_SYNC_TEST_INTEGRATION_P2P_INVALIDATION_FORWARDER_H_