Make the rest of the services have a similar raw/user interface structure.

service/taskqueue/raw_interface.go

Index: service/taskqueue/raw_interface.go
diff --git a/service/taskqueue/raw_interface.go b/service/taskqueue/raw_interface.go
new file mode 100644
index 0000000000000000000000000000000000000000..700c1a8c20f8a91866c64e3b8742d781fa0e3ce8
--- /dev/null
+++ b/service/taskqueue/raw_interface.go
@@ -0,0 +1,32 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package taskqueue
+
+// RawCB is a simple callback for RawInterface.DeleteMulti, getting the error
+// for the attempted deletion.
+type RawCB func(error)
+
+// RawTaskCB is the callback for RawInterface.AddMulti, getting the added task
+// and an error.
+type RawTaskCB func(*Task, error)
+
+// RawStatsCB is the callback for RawInterface.Stats. It takes the statistics
+// object, as well as an error (e.g. in case the queue doesn't exist).
+type RawStatsCB func(*Statistics, error)
+
+// RawInterface is the full interface to the Task Queue service.
+type RawInterface interface {
+	// AddMulti adds multiple tasks to the given queue, calling cb for each item.
+	//
+	// The task passed to the callback function will have all the default values
+	// filled in, and will have the Name field populated, if the input task was
+	// anonymous (e.g. the Name field was blank).
+	AddMulti(tasks []*Task, queueName string, cb RawTaskCB) error
+	DeleteMulti(tasks []*Task, queueName string, cb RawCB) error
+
+	Purge(queueName string) error
+
+	Stats(queueNames []string, cb RawStatsCB) error
+}