WebCrypto: refactor layout tests.

WebCrypto: refactor the layout tests.

Cleans up the layout tests to use a more idiomatic pattern for Promises. Before it was using a wrapper to serialize a set of async tests, whereas now it is creating a chain of Promises.

This change also adds some additional tests for algorithm normalization.

BUG=245025
R=abarth@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=156487

[abarth-chromium, 2013-08-21 17:21:26]

lgtm

Nice!

[commit-bot: I haz the power, 2013-08-21 17:21:35]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/eroman@chromium.org/23126008/3001

[commit-bot: I haz the power, 2013-08-21 18:47:59]

Retried try job too often on win_blink_rel for step(s) webkit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_blink_...

[eroman, 2013-08-21 19:10:51]

Committed patchset #1 manually as r156487 (presubmit successful).