Reland "Turn libbase into a component"

src/base/utils/random-number-generator.h

 // Copyright 2013 the V8 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.
 
 #ifndef V8_BASE_UTILS_RANDOM_NUMBER_GENERATOR_H_
 #define V8_BASE_UTILS_RANDOM_NUMBER_GENERATOR_H_
 
+#include "src/base/base-export.h"
 #include "src/base/macros.h"
 
 namespace v8 {
 namespace base {
 
 // -----------------------------------------------------------------------------
 // RandomNumberGenerator
 
 // This class is used to generate a stream of pseudo-random numbers. The class
 // uses a 64-bit seed, which is passed through MurmurHash3 to create two 64-bit
 // state values. This pair of state values is then used in xorshift128+.
 // The resulting stream of pseudo-random numbers has a period length of 2^128-1.
 // See Marsaglia: http://www.jstatsoft.org/v08/i14/paper
 // And Vigna: http://vigna.di.unimi.it/ftp/papers/xorshiftplus.pdf
 // NOTE: Any changes to the algorithm must be tested against TestU01.
 //       Please find instructions for this in the internal repository.
 
 // If two instances of RandomNumberGenerator are created with the same seed, and
 // the same sequence of method calls is made for each, they will generate and
 // return identical sequences of numbers.
 // This class uses (probably) weak entropy by default, but it's sufficient,
 // because it is the responsibility of the embedder to install an entropy source
 // using v8::V8::SetEntropySource(), which provides reasonable entropy, see:
 // https://code.google.com/p/v8/issues/detail?id=2905
 // This class is neither reentrant nor threadsafe.
 
-class RandomNumberGenerator final {
+class V8_BASE_EXPORT RandomNumberGenerator final {
  public:
   // EntropySource is used as a callback function when V8 needs a source of
   // entropy.
   typedef bool (*EntropySource)(unsigned char* buffer, size_t buflen);
   static void SetEntropySource(EntropySource entropy_source);
 
   RandomNumberGenerator();
   explicit RandomNumberGenerator(int64_t seed) { SetSeed(seed); }
 
   // Returns the next pseudorandom, uniformly distributed int value from this
@@ skipping 76 matching lines @@
 
   int64_t initial_seed_;
   uint64_t state0_;
   uint64_t state1_;
 };
 
 }  // namespace base
 }  // namespace v8
 
 #endif  // V8_BASE_UTILS_RANDOM_NUMBER_GENERATOR_H_