Implement Mail service.

impl/prod/mail.go

Index: impl/prod/mail.go
diff --git a/impl/prod/mail.go b/impl/prod/mail.go
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+++ b/impl/prod/mail.go
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+// 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 prod
+
+import (
+	gae_mail "github.com/luci/gae/service/mail"
+	"golang.org/x/net/context"
+	"google.golang.org/appengine/mail"
+)
+
+// useMail adds a mail service implementation to context, accessible
+// by "github.com/luci/gae/service/mail".Get(c)
+func useMail(c context.Context) context.Context {
+	return gae_mail.SetFactory(c, func(ci context.Context) gae_mail.Interface {
+		return mailImpl{AEContext(ci)}
+	})
+}
+
+type mailImpl struct {
+	aeCtx context.Context
+}
+
+func (m mailImpl) Send(msg *gae_mail.Message) error {
+	return mail.Send(m.aeCtx, msg.ToSDKMessage())
+}
+
+func (m mailImpl) SendToAdmins(msg *gae_mail.Message) error {
+	return mail.Send(m.aeCtx, msg.ToSDKMessage())
+}
+
+func (m mailImpl) Testable() gae_mail.Testable {
+	return nil
+}