GitLab

Add a feature that controls whether scrypt key derivation should be used
when a user sets a new custom passphrase. If the feature is disabled,
PBKDF2 will be used (i.e. old behavior).

Bug: 877933
Change-Id: I2009c8d8cfc7cef57743fbf8f3c9a6ec48ef07a4
Reviewed-on: https://chromium-review.googlesource.com/1193855
Commit-Queue: David Davidović <davidovic@google.com>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: vitaliii <vitaliii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587702}