[webcrypto] Don't execute cancelled crypto operations.

[webcrypto] Don't execute cancelled crypto operations.

BUG=375430
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=278274

[eroman, 2014-06-18 20:08:44]

The corresponding Blink side of this change is:
https://codereview.chromium.org/343723003

[Ryan Sleevi, 2014-06-18 23:59:52]

https://codereview.chromium.org/341923004/diff/20001/content/child/webcrypto/...
File content/child/webcrypto/webcrypto_impl.cc (right):

https://codereview.chromium.org/341923004/diff/20001/content/child/webcrypto/...
content/child/webcrypto/webcrypto_impl.cc:175: return result.cancelled();
Is this really safe? Seems like we try to only access |result| on
|origin_thread|, but your DoOp friends will be accessing it from the worker
thread.

[Ryan Sleevi, 2014-06-19 00:02:46]

Never mind, saw the comment on the WebKit side.

LGTM, although boo on atomics :/

[eroman, 2014-06-19 03:43:18]

The CQ bit was checked by eroman@chromium.org

[commit-bot: I haz the power, 2014-06-19 03:44:47]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/eroman@chromium.org/341923004/20001

[commit-bot: I haz the power, 2014-06-19 04:51:22]

Change committed as 278274