[Sync] Add support for server controlled nudge delays

sync/sessions/sync_session.h

 // Copyright 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.
 
 // A class representing an attempt to synchronize the local syncable data
 // store with a sync server. A SyncSession instance is passed as a stateful
 // bundle throughout the sync cycle.  The SyncSession is not reused across
 // sync cycles; each cycle starts with a new one.
 
 #ifndef SYNC_SESSIONS_SYNC_SESSION_H_
@@ skipping 53 matching lines @@
     virtual bool IsCurrentlyThrottled() = 0;
 
     // The client has been instructed to change its short poll interval.
     virtual void OnReceivedShortPollIntervalUpdate(
         const base::TimeDelta& new_interval) = 0;
 
     // The client has been instructed to change its long poll interval.
     virtual void OnReceivedLongPollIntervalUpdate(
         const base::TimeDelta& new_interval) = 0;
 
-    // The client has been instructed to change its sessions commit
-    // delay.
-    virtual void OnReceivedSessionsCommitDelay(
-        const base::TimeDelta& new_delay) = 0;
+    // The client has been instructed to change a nudge delay.
+    virtual void OnReceivedCustomNudgeDelays(
+        const std::map<ModelType, int>& nudge_delays) = 0;
 
     // Called for the syncer to respond to the error sent by the server.
     virtual void OnSyncProtocolError(
         const SyncProtocolError& sync_protocol_error) = 0;
 
     // Called when the server wants to change the number of hints the client
     // will buffer locally.
     virtual void OnReceivedClientInvalidationHintBufferSize(int size) = 0;
 
     // Called when server wants to schedule a retry GU.
@@ skipping 47 matching lines @@
   // Our controller for various status and error counters.
   scoped_ptr<StatusController> status_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncSession);
 };
 
 }  // namespace sessions
 }  // namespace syncer
 
 #endif  // SYNC_SESSIONS_SYNC_SESSION_H_