Avoid fallback to weak entropy for the PRNGs on Windows.

Avoid fallback to weak entropy for the PRNGs on Windows.

Add fallback to rand_s() to gather entropy on Windows for
seeding the random number generator. This is compatible
with what Blink does.

BUG=v8:2905
R=machenbach@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=16920

[Benedikt Meurer, 2013-09-24 07:45:33]

PTAL

[Benedikt Meurer, 2013-09-24 07:51:56]

CC'ing Dan.

[Michael Achenbach, 2013-09-24 12:55:39]

https://codereview.chromium.org/24315007/diff/1/src/utils/random-number-gener...
File src/utils/random-number-generator.cc (right):

https://codereview.chromium.org/24315007/diff/1/src/utils/random-number-gener...
src/utils/random-number-generator.cc:71: #if V8_OS_CYGIN || V8_OS_WIN
CYGWIN

[Benedikt Meurer, 2013-09-24 13:24:51]

https://codereview.chromium.org/24315007/diff/1/src/utils/random-number-gener...
File src/utils/random-number-generator.cc (right):

https://codereview.chromium.org/24315007/diff/1/src/utils/random-number-gener...
src/utils/random-number-generator.cc:71: #if V8_OS_CYGIN || V8_OS_WIN
On 2013/09/24 12:55:41, machenbach wrote:
> CYGWIN

Done.

[Michael Achenbach, 2013-09-24 13:26:15]

lgtm

[Benedikt Meurer, 2013-09-24 13:28:08]

Committed patchset #3 manually as r16920 (presubmit successful).