Add simplest service/urlfetch implementation.

impl/prod/context.go

 // 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 (
         "net/http"
 
         "golang.org/x/net/context"
         "google.golang.org/appengine"
 )
 
 // Use adds production implementations for all the gae services to the context,
 // using the existing context obtained by appengine.NewContext.
 //
 // The services added are:
 //   - github.com/luci/gae/service/datastore
 //   - github.com/luci/gae/service/taskqueue
 //   - github.com/luci/gae/service/memcache
 //   - github.com/luci/gae/service/info
+//   - github.com/luci/gae/service/urlfetch
 //
 // These can be retrieved with the <service>.Get functions.
 //
 // The implementations are all backed by the real appengine SDK functionality,
 func Use(c context.Context) context.Context {
-        return useRDS(useMC(useTQ(useGI(c))))
+        return useURLFetch(useRDS(useMC(useTQ(useGI(c)))))
 }
 
-// Use adds production implementations for all the gae services to the context.
+// UseRequest adds production implementations for all the gae services
+// to the context.
 //
 // The services added are:
 //   - github.com/luci/gae/service/datastore
 //   - github.com/luci/gae/service/taskqueue
 //   - github.com/luci/gae/service/memcache
 //   - github.com/luci/gae/service/info
+//   - github.com/luci/gae/service/urlfetch
 //
 // These can be retrieved with the <service>.Get functions.
 //
 // The implementations are all backed by the real appengine SDK functionality,
 func UseRequest(r *http.Request) context.Context {
-        return useRDS(useMC(useTQ(useGI(appengine.NewContext(r)))))
+        return useURLFetch(useRDS(useMC(useTQ(useGI(appengine.NewContext(r))))))
 }