Interface update, per-method Contexts.

service/mail/interface.go

Index: service/mail/interface.go
diff --git a/service/mail/interface.go b/service/mail/interface.go
index efc12581599d1531750c9a335e49f1a526f0cc4f..0306b339a7c3b7206ebf8346efd8f5ccf85b25cb 100644
--- a/service/mail/interface.go
+++ b/service/mail/interface.go
@@ -4,13 +4,33 @@
 
 package mail
 
-// Interface is the interface for all of the mail methods.
+import (
+	"golang.org/x/net/context"
+)
+
+// RawInterface is the interface for all of the mail methods.
 //
 // These replicate the methods found here:
 // https://godoc.org/google.golang.org/appengine/mail
-type Interface interface {
+type RawInterface interface {
 	Send(msg *Message) error
 	SendToAdmins(msg *Message) error
 
-	Testable() Testable
+	GetTestable() Testable
+}
+
+// Send sends an e-mail message.
+func Send(c context.Context, msg *Message) error {
+	return Raw(c).Send(msg)
+}
+
+// SendToAdmins sends an e-mail message to application administrators.
+func SendToAdmins(c context.Context, msg *Message) error {
+	return Raw(c).SendToAdmins(msg)
+}
+
+// GetTestable returns a testable extension interface, or nil if one is not
+// available.
+func GetTestable(c context.Context) Testable {
+	return Raw(c).GetTestable()
 }