sync: Move migration signal out of snapshot

sync/internal_api/sync_manager_impl.cc

 // 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.
 
 #include "sync/internal_api/sync_manager_impl.h"
 
 #include <string>
 
 #include "base/base64.h"
 #include "base/bind.h"
@@ skipping 927 matching lines @@
 void SyncManagerImpl::OnActionableError(const SyncProtocolError& error) {
   FOR_EACH_OBSERVER(
       SyncManager::Observer, observers_,
       OnActionableError(error));
 }
 
 void SyncManagerImpl::OnRetryTimeChanged(base::Time) {}
 
 void SyncManagerImpl::OnThrottledTypesChanged(ModelTypeSet) {}
 
+void SyncManagerImpl::OnMigrationRequested(ModelTypeSet types) {
+  FOR_EACH_OBSERVER(
+      SyncManager::Observer, observers_,
+      OnMigrationRequested(types));
+}
+
 void SyncManagerImpl::SetJsEventHandler(
     const WeakHandle<JsEventHandler>& event_handler) {
   js_event_handler_ = event_handler;
   js_sync_manager_observer_.SetJsEventHandler(js_event_handler_);
   js_mutation_event_observer_.SetJsEventHandler(js_event_handler_);
   js_sync_encryption_handler_observer_.SetJsEventHandler(js_event_handler_);
 }
 
 void SyncManagerImpl::ProcessJsMessage(
     const std::string& name, const JsArgList& args,
@@ skipping 279 matching lines @@
 int SyncManagerImpl::GetDefaultNudgeDelay() {
   return kDefaultNudgeDelayMilliseconds;
 }
 
 // static.
 int SyncManagerImpl::GetPreferencesNudgeDelay() {
   return kPreferencesNudgeDelayMilliseconds;
 }
 
 }  // namespace syncer