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

go/src/infra/gae/libs/gae/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 wrapper
+package gae
 
 type key int
 
 var (
         globalInfoKey key
 
-        datastoreKey key = 1
-        memcacheKey  key = 2
-        taskQueueKey key = 3
+        rawDatastoreKey key = 1
+        memcacheKey     key = 2
+        taskQueueKey    key = 3
 
-        timeNowKey  key = 4
+        datastoreKey key = 4
+
         mathRandKey key = 5
 )