Move test_random.h into media/base

media/blink/test_random.h

-// 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.
-
-#ifndef MEDIA_BLINK_TEST_RANDOM_H_
-#define MEDIA_BLINK_TEST_RANDOM_H_
-
-#include <stdint.h>
-
-// Vastly simplified ACM random class meant to only be used for testing.
-// This class is meant to generate predictable sequences of pseudorandom
-// numbers, unlike the classes in base/rand_util.h which are meant to generate
-// unpredictable sequences.
-// See
-// https://code.google.com/p/szl/source/browse/trunk/src/utilities/acmrandom.h
-// for more information.
-
-namespace media {
-
-class TestRandom {
- public:
-  explicit TestRandom(uint32_t seed) {
-    seed_ = seed & 0x7fffffff;  // make this a non-negative number
-    if (seed_ == 0 || seed_ == M) {
-      seed_ = 1;
-    }
-  }
-
-  int32_t Rand() {
-    static const uint64_t A = 16807;  // bits 14, 8, 7, 5, 2, 1, 0
-    seed_ = static_cast<int32_t>((seed_ * A) % M);
-    CHECK_GT(seed_, 0);
-    return seed_;
-  }
-
- private:
-  static const uint64_t M = 2147483647L;  // 2^32-1
-  int32_t seed_;
-};
-
-}  // namespace media
-
-#endif  // MEDIA_BLINK_TEST_RANDOM_H_