[webcrypto] Add OpenSSL implementation of RSA key generation.

[webcrypto] Add OpenSSL implementation of RSA key generation.

BUG=389317
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=285607

[Ryan Sleevi, 2014-07-21 20:56:57]

There's several non-OpenSSL specific bits here. Can you split them out?

[eroman, 2014-07-21 21:03:50]

Sure. I will turn this into a few dependent CLs, so the refactoring is extracted
separately.

[eroman, 2014-07-21 21:22:42]

Done. I rebased this change on top of https://codereview.chromium.org/401233004/
so it includes just the OpenSSL bits.

[Ryan Sleevi, 2014-07-24 23:01:58]

lgtm

[eroman, 2014-07-25 14:41:11]

The CQ bit was checked by eroman@chromium.org

[commit-bot: I haz the power, 2014-07-25 14:42:10]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/eroman@chromium.org/401363002/120001

[commit-bot: I haz the power, 2014-07-25 16:51:21]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  linux_chromium_clang_dbg on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_clang_...)

[commit-bot: I haz the power, 2014-07-25 17:12:12]

Change committed as 285607