Rewrote the PRNG using an xorshift* algorithm and moved the files from test/ to base/.

webrtc/test/random.h

-/*
- *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#ifndef WEBRTC_TEST_RANDOM_H_
-#define WEBRTC_TEST_RANDOM_H_
-
-#include <limits>
-
-#include "webrtc/typedefs.h"
-#include "webrtc/base/constructormagic.h"
-
-namespace webrtc {
-
-namespace test {
-
-class Random {
- public:
-  explicit Random(uint32_t seed);
-
-  // Return pseudo-random integer of the specified type.
-  template <typename T>
-  T Rand() {
-    static_assert(std::numeric_limits<T>::is_integer &&
-                      std::numeric_limits<T>::radix == 2 &&
-                      std::numeric_limits<T>::digits <= 32,
-                  "Rand is only supported for built-in integer types that are "
-                  "32 bits or smaller.");
-    return static_cast<T>(Rand(std::numeric_limits<uint32_t>::max()));
-  }
-
-  // Uniformly distributed pseudo-random number in the interval [0, t].
-  uint32_t Rand(uint32_t t);
-
-  // Uniformly distributed pseudo-random number in the interval [low, high].
-  uint32_t Rand(uint32_t low, uint32_t high);
-
-  // Normal Distribution.
-  int Gaussian(int mean, int standard_deviation);
-
-  // Exponential Distribution.
-  int Exponential(float lambda);
-
-  // TODO(solenberg): Random from histogram.
-  // template<typename T> int Distribution(const std::vector<T> histogram) {
-
- private:
-  uint32_t a_;
-  uint32_t b_;
-
-  RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(Random);
-};
-
-// Return pseudo-random number in the interval [0.0, 1.0).
-template <>
-float Random::Rand<float>();
-
-// Return pseudo-random boolean value.
-template <>
-bool Random::Rand<bool>();
-
-}  // namespace test
-}  // namespace webrtc
-
-#endif  // WEBRTC_TEST_RANDOM_H_