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Extend the OobeTest.NewUser test to verify the parameters passed
to the MountEx call to cryptohomed, including the verification
that the key label is "gaia".

To simulate the flow that is close to the real flow, the
FakeCryptohomeClient class is slightly enhanced to support
replying to MountEx with CRYPTOHOME_ERROR_ACCOUNT_NOT_FOUND when
no "create" proto field is provided. This allows to achieve the
simulation of the following flow:
(1) Chrome calls MountEx for the new user without specifying
    |create|;
(2) cryptohomed checks that this user doesn't exist, and replies
    with the CRYPTOHOME_ERROR_ACCOUNT_NOT_FOUND error;
(3) Chrome sees this errors and repeats the MountEx request with
    specifying |create|;
(4) cryptohomed creates the new mount and succeeds.

Bug: 983103
Test: browser_tests --gtest_filter=OobeTest.NewUser
Change-Id: If27bcb05187219e046025f469ffe8bfe5c214562
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1690880
Commit-Queue: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Denis Kuznetsov <antrim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678276}