Refactor keys and queries in datastore service and implementation.

service/taskqueue/taskqueue.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 taskqueue
 
 import (
         "github.com/luci/luci-go/common/errors"
         "golang.org/x/net/context"
 )
@@ skipping 63 matching lines @@
 func (t *taskqueueImpl) Raw() RawInterface {
         return t.RawInterface
 }
 
 func (t *taskqueueImpl) Testable() Testable {
         return t.RawInterface.Testable()
 }
 
 var _ Interface = (*taskqueueImpl)(nil)
 
+// Get gets the Interface implementation from context.
 func Get(c context.Context) Interface {
         return &taskqueueImpl{GetRaw(c)}
 }