WIP.

components/drive/service/drive_service_interface.h

Index: components/drive/service/drive_service_interface.h
diff --git a/components/drive/service/drive_service_interface.h b/components/drive/service/drive_service_interface.h
index 43ff235222ba4f5b1a8a4ff8b267d789f0899365..cae41171185775b7ba6f2d9766d038338f70c53c 100644
--- a/components/drive/service/drive_service_interface.h
+++ b/components/drive/service/drive_service_interface.h
@@ -217,6 +217,9 @@ class DriveServiceInterface : public DriveServiceBatchOperationsInterface {
       const google_apis::FileListCallback& callback) = 0;
 
   // Fetches a file list in the directory with |directory_resource_id|.
+  // |team_drive_id| must be an empty string if |directory_resource_id| points
+  // a directory under My Drive, or the ID of the team drive which the target
+  // directory is owned by.
   // |callback| will be called upon completion.
   // If the list is too long, it may be paged. In such a case, a URL to fetch
   // remaining results will be included in the returned result. See also
@@ -226,6 +229,7 @@ class DriveServiceInterface : public DriveServiceBatchOperationsInterface {
   // |callback| must not be null.
   virtual google_apis::CancelCallback GetFileListInDirectory(
       const std::string& directory_resource_id,
+      const std::string& team_drive_id,
       const google_apis::FileListCallback& callback) = 0;
 
   // Searches the resources for the |search_query| from all the user's