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This adds a ScopedTouchIdTestEnvironment class to allow convenient
faking functionality of the Touch ID authenticator that requires
hardware support or user interaction.

TouchIdContext is modified to:
 - allow injection of fakes through TouchIdContext::Create, in order to
disable fingerprint prompts;
 - allow overriding the value returned by
TouchIdContext::TouchIdAvailable, which determines hardware support and
configuration status for Touch ID.

The Keychain wrapper class is modified to allow injection of a fake into
the singleton returned by Keychain::GetInstance. (FakeKeychain
implementation will be done in a follow-up CL).

Change-Id: I1b801b5bbe9b787965a5958206e6772a9a5eb09a
Reviewed-on: https://chromium-review.googlesource.com/1162946
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582278}