Setup field trial for one-click signin inforbar.
BUG=
147227
TEST=There are two variants: the normal infobar and the blue-on-white infobar. Start chrome with one of the following command line options to force one or the other:
--force-fieldtrials="OneClickSignIn/Standard/"
--force-fieldtrials="OneClickSignIn/BlueOnWhite/"
Committed:
http://src.chromium.org/viewvc/chrome?view=rev&revision=156715