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

tools/gyp/v8.gyp

 # Copyright 2012 the V8 project authors. All rights reserved.
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 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
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 #     * Redistributions in binary form must reproduce the above
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@@ skipping 513 matching lines @@
         '../../src/typing.h',
         '../../src/unbound-queue-inl.h',
         '../../src/unbound-queue.h',
         '../../src/unicode-inl.h',
         '../../src/unicode.cc',
         '../../src/unicode.h',
         '../../src/uri.h',
         '../../src/utils-inl.h',
         '../../src/utils.cc',
         '../../src/utils.h',
+        '../../src/utils/random-number-generator.cc',
+        '../../src/utils/random-number-generator.h',
         '../../src/v8-counters.cc',
         '../../src/v8-counters.h',
         '../../src/v8.cc',
         '../../src/v8.h',
         '../../src/v8checks.h',
         '../../src/v8conversions.cc',
         '../../src/v8conversions.h',
         '../../src/v8globals.h',
         '../../src/v8memory.h',
         '../../src/v8threads.cc',
@@ skipping 525 matching lines @@
         }],
         ['v8_compress_startup_data=="bz2"', {
           'libraries': [
             '-lbz2',
           ]
         }],
       ],
     },
   ],
 }