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

go/src/infra/gae/libs/gae/mathrand.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
 
 import (
+        "golang.org/x/net/context"
         "math/rand"
 
-        "golang.org/x/net/context"
-        "infra/libs/clock"
+        "github.com/luci/luci-go/common/clock"
 )
 
 // MathRandFactory is the function signature for factory methods compatible with
 // SetMathRandFactory.
 type MathRandFactory func(context.Context) *rand.Rand
 
 // GetMathRand gets a *"math/rand".Rand from the context. If one hasn't been
 // set, this creates a new Rand object with a Source initialized from the
 // current time clock.Now(c).UnixNano().
 func GetMathRand(c context.Context) *rand.Rand {
@@ skipping 11 matching lines @@
 
 // SetMathRand sets the current *"math/rand".Rand object in the context. Useful
 // for testing with a quick mock. This is just a shorthand SetMathRandFactory
 // invocation to set a factory which always returns the same object.
 func SetMathRand(c context.Context, r *rand.Rand) context.Context {
         if r == nil {
                 return SetMathRandFactory(c, nil)
         }
         return SetMathRandFactory(c, func(context.Context) *rand.Rand { return r })
 }