Adds javascript utilities for the following SAML features:

- Extracting useful information about password expiry from a SAML response.
- Understanding timestamps in a variety of formats.

These are not yet used, but will be useful for the notifying about expired
passwords as part of the SAML password-change project.

Test:
browser_tests --gtest_filter="Saml*UnitTest*"

Bug: 930109
Change-Id: Ifbea42ac984bf496419159dff8f0fc26b67dc7bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1489248
Reviewed-by: David Tseng <dtseng@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: A Olsen <olsen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#639083}
8 files changed