[Sync] Sync client should to exponential backoff when receive partial failure

components/sync/engine_impl/cycle/test_util.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 COMPONENTS_SYNC_ENGINE_IMPL_CYCLE_TEST_UTIL_H_
 #define COMPONENTS_SYNC_ENGINE_IMPL_CYCLE_TEST_UTIL_H_
 
 #include "components/sync/engine_impl/cycle/sync_cycle.h"
 #include "components/sync/engine_impl/syncer.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ skipping 41 matching lines @@
 void SimulatePollFailed(ModelTypeSet requested_types, SyncCycle* cycle);
 
 void SimulateGuRetryDelayCommandImpl(SyncCycle* cycle, base::TimeDelta delay);
 
 void SimulateThrottledImpl(SyncCycle* cycle, const base::TimeDelta& delta);
 
 void SimulateTypesThrottledImpl(SyncCycle* cycle,
                                 ModelTypeSet types,
                                 const base::TimeDelta& delta);
 
+void SimulatePartialFailureImpl(SyncCycle* cycle, ModelTypeSet types);
+
 // Works with poll cycles.
 void SimulatePollIntervalUpdateImpl(ModelTypeSet requested_types,
                                     SyncCycle* cycle,
                                     const base::TimeDelta& new_poll);
 
 // Works with normal cycles.
 void SimulateSessionsCommitDelayUpdateImpl(ModelTypeSet requested_types,
                                            NudgeTracker* nudge_tracker,
                                            SyncCycle* cycle,
                                            const base::TimeDelta& new_delay);
 
 ACTION_P(SimulateThrottled, throttle) {
   SimulateThrottledImpl(arg0, throttle);
 }
 
 ACTION_P2(SimulateTypesThrottled, types, throttle) {
   SimulateTypesThrottledImpl(arg0, types, throttle);
 }
 
+ACTION_P(SimulatePartialFailure, types) {
+  SimulatePartialFailureImpl(arg0, types);
+}
+
 ACTION_P(SimulatePollIntervalUpdate, poll) {
   SimulatePollIntervalUpdateImpl(arg0, arg1, poll);
 }
 
 ACTION_P(SimulateSessionsCommitDelayUpdate, poll) {
   SimulateSessionsCommitDelayUpdateImpl(arg0, arg1, arg2, poll);
 }
 
 ACTION_P(SimulateGuRetryDelayCommand, delay) {
   SimulateGuRetryDelayCommandImpl(arg0, delay);
 }
 
 }  // namespace test_util
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_ENGINE_IMPL_CYCLE_TEST_UTIL_H_