DriveFileSyncService listens to OnAuthenticated event to recover from unavailable state

chrome/browser/sync_file_system/drive_file_sync_service.h

Index: chrome/browser/sync_file_system/drive_file_sync_service.h
diff --git a/chrome/browser/sync_file_system/drive_file_sync_service.h b/chrome/browser/sync_file_system/drive_file_sync_service.h
index b1ceb2a691fade2e76fa64cda4ffa9a115c18b81..14a86dec4bc3b6f4902ac3b590919eff9e267fa5 100644
--- a/chrome/browser/sync_file_system/drive_file_sync_service.h
+++ b/chrome/browser/sync_file_system/drive_file_sync_service.h
@@ -17,6 +17,7 @@
 #include "base/observer_list.h"
 #include "base/threading/non_thread_safe.h"
 #include "chrome/browser/google_apis/drive_service_interface.h"
+#include "chrome/browser/sync_file_system/drive_file_sync_client.h"
 #include "chrome/browser/sync_file_system/local_change_processor.h"
 #include "chrome/browser/sync_file_system/remote_file_sync_service.h"
 #include "webkit/fileapi/syncable/file_change.h"
@@ -32,7 +33,6 @@ class Location;
 
 namespace sync_file_system {
 
-class DriveFileSyncClient;
 class DriveMetadataStore;
 
 // Maintains remote file changes.
@@ -40,6 +40,7 @@ class DriveMetadataStore;
 class DriveFileSyncService
     : public RemoteFileSyncService,
       public LocalChangeProcessor,
+      public DriveFileSyncClientObserver,
       public base::NonThreadSafe {
  public:
   static const char kServiceName[];
@@ -82,6 +83,9 @@ class DriveFileSyncService
       const fileapi::FileSystemURL& url,
       const fileapi::SyncStatusCallback& callback) OVERRIDE;
 
+  // DriveFileSyncClientObserver overrides.
+  virtual void OnAuthenticated() OVERRIDE;
+
  private:
   friend class DriveFileSyncServiceTest;
   class TaskToken;