"flat_key","key","int_value","string_value"
"chrome_mojo_event_info.mojo_interface_tag","chrome_mojo_event_info.mojo_interface_tag","[NULL]","Class::Method"
"chrome_mojo_event_info.mojo_interface_tag","chrome_mojo_event_info.mojo_interface_tag","[NULL]","Func"
"chrome_mojo_event_info.mojo_interface_tag","chrome_mojo_event_info.mojo_interface_tag","[NULL]","storage.mojom.Directory"
"chrome_mojo_event_info.mojo_interface_tag","chrome_mojo_event_info.mojo_interface_tag","[NULL]","storage.mojom.File"
"chrome_mojo_event_info.mojo_method_name","chrome_mojo_event_info.mojo_method_name","[NULL]","Class::Method"
"chrome_mojo_event_info.mojo_method_name","chrome_mojo_event_info.mojo_method_name","[NULL]","Func"
"chrome_mojo_event_info.mojo_method_name","chrome_mojo_event_info.mojo_method_name","[NULL]","storage::mojom::Directory::OpenFile"
"chrome_mojo_event_info.mojo_method_name","chrome_mojo_event_info.mojo_method_name","[NULL]","storage::mojom::File::Close"
"event.category","event.category","[NULL]","cat1"
"event.category","event.category","[NULL]","cat1"
"event.category","event.category","[NULL]","cat1"
"event.category","event.category","[NULL]","cat1"
"event.name","event.name","[NULL]","slice1"
"event.name","event.name","[NULL]","slice2"
"event.name","event.name","[NULL]","slice3"
"event.name","event.name","[NULL]","slice4"
"is_root_in_scope","is_root_in_scope",1,"[NULL]"
"source","source","[NULL]","descriptor"
"source_id","source_id",12345,"[NULL]"