Note: the blocking bug should be implemented first (or implemented together and then sent out as its own precursor CL). 

CL https://chromium-review.googlesource.com/c/chromium/src/+/1343019 (including a big for 906618).

This is a dup

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/fa626b9fede1d7f3e04ef072615d9b40b81e9442

commit fa626b9fede1d7f3e04ef072615d9b40b81e9442
Author: Antonio Gomes <tonikitoo@igalia.com>
Date: Mon Nov 26 14:29:45 2018

[s13n] Convert identity_apitest.cc to use IdentityTestEnvironment

This bug is a follow up of [1] and [2], where production code
(//c/b/extensions/api/identity/identity_api.cc) is migrated away from
using PO2TS in favor of IdentityManager, and the API is extended to
accommodate the needs of this migration, respectively.

[1] https://crrev.com/b/1340890
[2] https://crrev.com/b/1346609

BUG= 906615 

Change-Id: Ib41f99f08b7d181bbcff28be97c8b55993aa8c04
Reviewed-on: https://chromium-review.googlesource.com/c/1343019
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610844}
[modify] https://crrev.com/fa626b9fede1d7f3e04ef072615d9b40b81e9442/chrome/browser/extensions/api/identity/identity_apitest.cc