sync: Support nudges from non-blocking sync types

sync/sessions/model_type_registry.h

 // 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_ENGINE_MODEL_TYPE_REGISTRY_H_
 #define SYNC_ENGINE_MODEL_TYPE_REGISTRY_H_
 
 #include <map>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
 #include "sync/base/sync_export.h"
+#include "sync/engine/nudge_handler.h"
 #include "sync/internal_api/public/base/model_type.h"
 #include "sync/internal_api/public/engine/model_safe_worker.h"
 #include "sync/internal_api/public/sessions/type_debug_info_observer.h"
 #include "sync/internal_api/public/sync_context.h"
 
 namespace syncer {
 
 namespace syncable {
 class Directory;
 }  // namespace syncable
 
 class CommitContributor;
 class DirectoryCommitContributor;
 class DirectoryUpdateHandler;
 class DirectoryTypeDebugInfoEmitter;
 class ModelTypeSyncWorkerImpl;
 class ModelTypeSyncProxyImpl;
 class UpdateHandler;
 struct DataTypeState;
 
 typedef std::map<ModelType, UpdateHandler*> UpdateHandlerMap;
 typedef std::map<ModelType, CommitContributor*> CommitContributorMap;
 typedef std::map<ModelType, DirectoryTypeDebugInfoEmitter*>
     DirectoryTypeDebugInfoEmitterMap;
 
 // Keeps track of the sets of active update handlers and commit contributors.
 class SYNC_EXPORT_PRIVATE ModelTypeRegistry : public SyncContext {
  public:
-  // This alternative constructor does not support any directory types.
-  // It is used only in tests.
-  ModelTypeRegistry();
-
   // Constructs a ModelTypeRegistry that supports directory types.
-  ModelTypeRegistry(
-      const std::vector<scoped_refptr<ModelSafeWorker> >& workers,
-      syncable::Directory* directory);
+  ModelTypeRegistry(const std::vector<scoped_refptr<ModelSafeWorker> >& workers,
+                    syncable::Directory* directory,
+                    NudgeHandler* nudge_handler);
   virtual ~ModelTypeRegistry();
 
   // Sets the set of enabled types.
   void SetEnabledDirectoryTypes(const ModelSafeRoutingInfo& routing_info);
 
   // Enables an off-thread type for syncing.  Connects the given proxy
   // and its task_runner to the newly created worker.
   //
   // Expects that the proxy's ModelType is not currently enabled.
   virtual void ConnectSyncTypeToWorker(
@@ skipping 47 matching lines @@
   // Non-blocking types handle debug info differently.
   // Does not own its contents.
   DirectoryTypeDebugInfoEmitterMap directory_type_debug_info_emitter_map_;
 
   // The known ModelSafeWorkers.
   std::map<ModelSafeGroup, scoped_refptr<ModelSafeWorker> > workers_map_;
 
   // The directory.  Not owned.
   syncable::Directory* directory_;
 
+  // The NudgeHandler.  Not owned.
+  NudgeHandler* nudge_handler_;
+
   // The set of enabled directory types.
   ModelTypeSet enabled_directory_types_;
 
   // The set of observers of per-type debug info.
   //
   // Each of the DirectoryTypeDebugInfoEmitters needs such a list.  There's
   // a lot of them, and their lifetimes are unpredictable, so it makes the
   // book-keeping easier if we just store the list here.  That way it's
   // guaranteed to live as long as this sync backend.
   ObserverList<TypeDebugInfoObserver> type_debug_info_observers_;
 
   base::WeakPtrFactory<ModelTypeRegistry> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ModelTypeRegistry);
 };
 
 }  // namespace syncer
 
 #endif // SYNC_ENGINE_MODEL_TYPE_REGISTRY_H_