mandoline filesystem: Save cookie data to the mojo:filesystem.

components/filesystem/public/interfaces/file_system.mojom

Index: components/filesystem/public/interfaces/file_system.mojom
diff --git a/components/filesystem/public/interfaces/file_system.mojom b/components/filesystem/public/interfaces/file_system.mojom
index 263121600f36578cc8a144d960738cc42ae336dd..72785636ddaf92159f1375431f8eedd8916ad1b0 100644
--- a/components/filesystem/public/interfaces/file_system.mojom
+++ b/components/filesystem/public/interfaces/file_system.mojom
@@ -7,8 +7,21 @@ module filesystem;
 import "components/filesystem/public/interfaces/directory.mojom";
 import "components/filesystem/public/interfaces/types.mojom";
 
+// Callback interface for FileSystem. When we call OpenFileSystem, we supply a
+// client to receive and handle the shutdown signal. Just because the shell has
+// closed the application connection to the FileSystem doesn't mean that we
+// should immediately kill all connections to our clients. We notify them that
+// we are shutting down so that they can flush any data and cleanly shutdown.
+//
+// Actual connection lifetime is controlled by the lifetime of the |directory|
+// object.
+interface FileSystemClient {
+  OnFileSystemShutdown();
+};
+
 interface FileSystem {
   // Opens the root directory for the file system with the given name; null
   // yields the default file system, if any.
-  OpenFileSystem(string? file_system, Directory& directory) => (FileError error);
+  OpenFileSystem(string? file_system, Directory& directory,
+                 FileSystemClient client) => (FileError error);
 };