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Add a browser test for the logic that triggers the system slot
initialization whenever the TPM goes into the "ready" state as
notified by cryptohomed (added in r698007).

The test exercises the following codepath (this description
skips some intermediate callers for the sake of brevity):
1. SystemTokenCertDBInitializer is notified by the
   chromeos::[Fake]CryptohomeClient that TpmInitStatusUpdated
   with |ready|==true;
2. chromeos::TPMTokenLoader::EnsureStarted() gets called;
3. crypto::InitializeTPMTokenAndSystemSlot() gets called.

This is verified by the test by opening a web page in the
Chrome OS Login screen that uses client cert authentication.
If the codepath mentioned above wouldn't work, the test would
fail due to ClientCertFilterChromeOS waiting infinitely for
the result from crypto::GetSystemNSSKeySlot().

Bug: 725500
Change-Id: I17e0fa42d3fda7d0deed5f86a2ab99b079865b36
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1815857
Commit-Queue: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Matt Mueller <mattm@chromium.org>
Reviewed-by: David Benjamin <davidben@chromium.org>
Reviewed-by: Pavol Marko <pmarko@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705243}