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Add a Mojo interface - AccountManager - for lacros-chrome to talk to
Chrome OS Account Manager residing in ash-chrome.

Implement a method in this interface:
- |IsInitialized@0() => (bool is_initialized);|
which returns |true| when Chrome OS Account Manager has been fully
initialized, and |false| otherwise.

Bug: 1117478
Test: unit_tests --gtest_filter="*AccountManagerAshTest*"
Change-Id: Ia67a51f0d9051af6c0bd311ff5a63155385741a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2363748Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Commit-Queue: Kush Sinha <sinhak@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811154}