Refactor current GAE abstraction library to be free of the SDK*

go/src/infra/gae/libs/wrapper/memory/globalinfo.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 memory
-
-import (
-        "infra/gae/libs/wrapper"
-
-        "golang.org/x/net/context"
-)
-
-type giContextKeyType int
-
-var giContextKey giContextKeyType
-
-func curGID(c context.Context) *globalInfoData {
-        return c.Value(giContextKey).(*globalInfoData)
-}
-
-// useGI adds a wrapper.GlobalInfo context, accessible
-// by wrapper.GetGI(c)
-func useGI(c context.Context) context.Context {
-        return wrapper.SetGIFactory(c, func(ic context.Context) wrapper.GlobalInfo {
-                return &giImpl{wrapper.DummyGI(), curGID(ic), ic}
-        })
-}
-
-type globalInfoData struct{ namespace string }
-
-type giImpl struct {
-        wrapper.GlobalInfo
-        data *globalInfoData
-        c    context.Context
-}
-
-var _ = wrapper.GlobalInfo((*giImpl)(nil))
-
-func (gi *giImpl) Namespace(ns string) (context.Context, error) {
-        return context.WithValue(gi.c, giContextKey, &globalInfoData{ns}), nil
-}