Introduce a RandonNumberGenerator class. Refactor the random/private_random uses in Isolate/Context.

src/platform.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 68 matching lines @@
   if ((intgr & 1) != 0 && intgr - flt == 0.5) {
     // If the number is halfway between two integers, round to the even one.
     intgr--;
   }
 #endif
   return intgr;
 }
 
 #endif  // V8_CC_MSVC
 
-// Random is missing on both Visual Studio and MinGW.
-#if V8_CC_MSVC || V8_CC_MINGW
-int random();
-#endif  // V8_CC_MSVC || V8_CC_MINGW
-
 namespace v8 {
 namespace internal {
 
 double ceiling(double x);
 double modulo(double x, double y);
 
 // Custom implementation of math functions.
 double fast_sin(double input);
 double fast_cos(double input);
 double fast_tan(double input);
@@ skipping 60 matching lines @@
 
 // ----------------------------------------------------------------------------
 // OS
 //
 // This class has static methods for the different platform specific
 // functions. Add methods here to cope with differences between the
 // supported platforms.
 
 class OS {
  public:
-  // Initializes the platform OS support. Called once at VM startup.
-  static void SetUp();
-
   // Initializes the platform OS support that depend on CPU features. This is
   // called after CPU initialization.
   static void PostSetUp();
 
   // Returns the accumulated user time for thread. This routine
   // can be used for profiling. The implementation should
   // strive for high-precision timer resolution, preferable
   // micro-second resolution.
   static int GetUserTime(uint32_t* secs,  uint32_t* usecs);
 
@@ skipping 411 matching lines @@
   char name_[kMaxThreadNameLength];
   int stack_size_;
   Semaphore* start_semaphore_;
 
   DISALLOW_COPY_AND_ASSIGN(Thread);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_PLATFORM_H_