Implement SyncFileSystemService::GetFileSyncStatus method

chrome/browser/sync_file_system/local_file_sync_service.h

Index: chrome/browser/sync_file_system/local_file_sync_service.h
diff --git a/chrome/browser/sync_file_system/local_file_sync_service.h b/chrome/browser/sync_file_system/local_file_sync_service.h
index 659c0e2e4791ab51bf70b01562666416cab93d5d..8efa7489bbb712fd0e8b8e46d61c9fae3382546c 100644
--- a/chrome/browser/sync_file_system/local_file_sync_service.h
+++ b/chrome/browser/sync_file_system/local_file_sync_service.h
@@ -52,6 +52,9 @@ class LocalFileSyncService
     DISALLOW_COPY_AND_ASSIGN(Observer);
   };
 
+  typedef base::Callback<void(bool has_pending_changes)>
+      HasPendingLocalChangeCallback;
+
   LocalFileSyncService();
   virtual ~LocalFileSyncService();
 
@@ -80,6 +83,12 @@ class LocalFileSyncService
   void ProcessLocalChange(LocalChangeProcessor* processor,
                           const fileapi::SyncFileCallback& callback);
 
+  // Returns true via |callback| if the given file |url| has local pending
+  // changes.
+  void HasPendingLocalChanges(
+      const fileapi::FileSystemURL& url,
+      const HasPendingLocalChangeCallback& callback);
+
   // Returns the metadata of a remote file pointed by |url|.
   virtual void GetLocalFileMetadata(
       const fileapi::FileSystemURL& url,