[SyncFS] Migrate SyncWorker::Observer to SyncWorkerInterface

chrome/browser/sync_file_system/drive_backend/sync_worker_interface.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 CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_SYNC_WORKER_INTERFACE_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_SYNC_WORKER_INTERFACE_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/sync_file_system/remote_file_sync_service.h"
+#include "chrome/browser/sync_file_system/sync_action.h"
 #include "chrome/browser/sync_file_system/sync_callbacks.h"
+#include "chrome/browser/sync_file_system/sync_direction.h"
 #include "net/base/network_change_notifier.h"
 
 class GURL;
 
 namespace base {
 class FilePath;
 class ListValue;
 }
 
 namespace drive {
@@ skipping 11 matching lines @@
 class SyncFileMetadata;
 
 namespace drive_backend {
 
 class MetadataDatabase;
 class RemoteChangeProcessorOnWorker;
 class SyncTaskManager;
 
 class SyncWorkerInterface {
  public:
+  class Observer {
+   public:
+    virtual void OnPendingFileListUpdated(int item_count) = 0;
+    virtual void OnFileStatusChanged(const fileapi::FileSystemURL& url,
+                                     SyncFileStatus file_status,
+                                     SyncAction sync_action,
+                                     SyncDirection direction) = 0;
+    virtual void UpdateServiceState(RemoteServiceState state,
+                                    const std::string& description) = 0;
+
+   protected:
+    virtual ~Observer() {}
+  };
+
+  SyncWorkerInterface() {}
   virtual ~SyncWorkerInterface() {}
 
   // Initializes SyncWorkerInterface after constructions of some member classes.
   virtual void Initialize() = 0;
 
   // See RemoteFileSyncService for the details.
   virtual void RegisterOrigin(const GURL& origin,
                               const SyncStatusCallback& callback) = 0;
   virtual void EnableOrigin(const GURL& origin,
                             const SyncStatusCallback& callback) = 0;
@@ skipping 33 matching lines @@
   virtual void OnNetworkChanged(
       net::NetworkChangeNotifier::ConnectionType type) = 0;
 
   virtual drive::DriveServiceInterface* GetDriveService() = 0;
   virtual drive::DriveUploaderInterface* GetDriveUploader() = 0;
   virtual MetadataDatabase* GetMetadataDatabase() = 0;
   virtual SyncTaskManager* GetSyncTaskManager() = 0;
 
   virtual void DetachFromSequence() = 0;
 
+  virtual void AddObserver(Observer* observer) = 0;
+
  private:
   friend class SyncEngineTest;
 
   // TODO(peria): Remove this interface after making FakeSyncWorker class.
   virtual void SetHasRefreshToken(bool has_refresh_token) = 0;
+
+  DISALLOW_COPY_AND_ASSIGN(SyncWorkerInterface);
 };
 
 }  // namespace drive_backend
 }  // namespace sync_file_system
 
 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_SYNC_WORKER_INTERFACE_H_