When creating easy signin challenge, user easyUnlock.WrapPublicKey method
This adds client code for easyUnlock.WrapPublicKey methos and utilizes it
in easy signin challenge creation procedure.
The method converts DER formatted public RSA key to public key format
used by secure messages exchanged over communication channel with the phone.
Instead of hardcoding the wrapped public key, we now hardcode the public key
(one step closer to desired logic -> not hardcoding anything).
Also, reordered methods in dbus client to match the order in service code.
BUG=409027
Review URL: https://codereview.chromium.org/
700663002
Cr-Commit-Position: refs/heads/master@{#302902}