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This CL adds a new field to OAuth2MintTokenConsentResult proto, modifies
the parsing function and plumbs this new field to
GaiaRemoteConsentFlow::Delegate::OnGaiaRemoteConsentFlowApproved().

IdentityGetAuthTokenFunction is going to remember this gaia id and reuse
the same account for the next calls.

The usage of the gaia id will be added in future CLs.

Bug: 1026237
Change-Id: Ieb407ee26d8b2ab9e4a4f4bb3c164f5c88c37440
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2042097Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Alex Ilin <alexilin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739039}