Better attempt at an appengine wrapper.

go/src/infra/gae/libs/wrapper/gae/taskqueue.go

Index: go/src/infra/gae/libs/wrapper/gae/taskqueue.go
diff --git a/go/src/infra/gae/libs/wrapper/gae/taskqueue.go b/go/src/infra/gae/libs/wrapper/gae/taskqueue.go
new file mode 100644
index 0000000000000000000000000000000000000000..a448a51c6c5ef81729482949abfb61fcd9509529
--- /dev/null
+++ b/go/src/infra/gae/libs/wrapper/gae/taskqueue.go
@@ -0,0 +1,68 @@
+// 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 gae
+
+import (
+	"golang.org/x/net/context"
+
+	"appengine"
+	"appengine/taskqueue"
+
+	"infra/gae/libs/wrapper"
+)
+
+// UseTQ adds a wrapper.TaskQueue implementation to context, accessible
+// by wrapper.GetTQ(c)
+func UseTQ(c context.Context) context.Context {
+	return wrapper.SetTQFactory(c, func(ci context.Context) wrapper.TaskQueue {
+		return tqImpl{ctx(ci).Context}
+	})
+}
+
+type tqImpl struct {
+	appengine.Context
+}
+
+//////// TQSingleReadWriter
+
+func (t tqImpl) Add(task *taskqueue.Task, queueName string) (*taskqueue.Task, error) {
+	return taskqueue.Add(t.Context, task, queueName)
+}
+func (t tqImpl) Delete(task *taskqueue.Task, queueName string) error {
+	return taskqueue.Delete(t.Context, task, queueName)
+}
+
+//////// TQMultiReadWriter
+
+func (t tqImpl) AddMulti(tasks []*taskqueue.Task, queueName string) ([]*taskqueue.Task, error) {
+	return taskqueue.AddMulti(t.Context, tasks, queueName)
+}
+func (t tqImpl) DeleteMulti(tasks []*taskqueue.Task, queueName string) error {
+	return taskqueue.DeleteMulti(t.Context, tasks, queueName)
+}
+
+//////// TQLeaser
+
+func (t tqImpl) Lease(maxTasks int, queueName string, leaseTime int) ([]*taskqueue.Task, error) {
+	return taskqueue.Lease(t.Context, maxTasks, queueName, leaseTime)
+}
+func (t tqImpl) LeaseByTag(maxTasks int, queueName string, leaseTime int, tag string) ([]*taskqueue.Task, error) {
+	return taskqueue.LeaseByTag(t.Context, maxTasks, queueName, leaseTime, tag)
+}
+func (t tqImpl) ModifyLease(task *taskqueue.Task, queueName string, leaseTime int) error {
+	return taskqueue.ModifyLease(t.Context, (*taskqueue.Task)(task), queueName, leaseTime)
+}
+
+//////// TQPurger
+
+func (t tqImpl) Purge(queueName string) error {
+	return taskqueue.Purge(t.Context, queueName)
+}
+
+//////// TQStatter
+
+func (t tqImpl) QueueStats(queueNames []string, maxTasks int) ([]taskqueue.QueueStatistics, error) {
+	return taskqueue.QueueStats(t.Context, queueNames, maxTasks)
+}