[fsp] Introduce file_system_provider::Service class for the FileSystemProvider API.

webkit/common/fileapi/file_system_types.h

Index: webkit/common/fileapi/file_system_types.h
diff --git a/webkit/common/fileapi/file_system_types.h b/webkit/common/fileapi/file_system_types.h
index 48c77957ce5aa70e9d3b3085b4d11259f2f20c03..c24d8d3b410a739583ebd7ed2874b2addb676e56 100644
--- a/webkit/common/fileapi/file_system_types.h
+++ b/webkit/common/fileapi/file_system_types.h
@@ -119,6 +119,9 @@ enum FileSystemType {
   // A filesystem that is mounted via the Privet storage protocol.
   kFileSystemTypeCloudDevice,
 
+  // A filesystem that is mounted via the FileSystemProvider API.
+  kFileSystemTypeProvided,
+
   // --------------------------------------------------------------------
   // Marks the end of internal type enum. (This is not the actual fs type)
   // New internal filesystem types must be added above this line.