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This CL adds tests that check if interested data types and FCM token are
included in device info when relevant feature flags are enabled.

For now, FakeInstanceID::GetToken() always returns the same token, but
that will be changed when FakeServerSyncInvalidationsSender is added.

Bug: 1135167
Change-Id: Ide98c9371ad788be804342899b6a561ef2b30e41
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2450150
Commit-Queue: Paula Vidas <paulavidas@google.com>
Reviewed-by: Rushan Suleymanov <rushans@google.com>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815523}