As a first step here we will be wrapping SigninManager::SignOut() with IdentityManager::ClearPrimaryAccount() (at the C++ level).

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5f93c62cc61886548a16b0c73a6d6b0fca9d0d65

commit 5f93c62cc61886548a16b0c73a6d6b0fca9d0d65
Author: chcunningham <chcunningham@chromium.org>
Date: Thu Aug 02 15:27:33 2018

Signin for UserPolicy Signin/Signout Tests

Adds call to SigninManager::SignIn(...) as part of TestSuccessfulSignin
helper method. This is needed to simulate real signin and becomes
critical with upcoming changes* to FakeSigninManager.

*https://chromium-review.googlesource.com/c/chromium/src/+/1154985

Bug:  806781 
Change-Id: I973859ef52bcddd978429dbb4ce9d913224c7b0d
Reviewed-on: https://chromium-review.googlesource.com/1160492
Commit-Queue: Chrome Cunningham (In Paris) <chcunningham@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580194}
[modify] https://crrev.com/5f93c62cc61886548a16b0c73a6d6b0fca9d0d65/chrome/browser/policy/cloud/user_policy_signin_service_unittest.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/4c0a4b4e4fcdb18f1e3710e00cf0ebde46b8d4f3

commit 4c0a4b4e4fcdb18f1e3710e00cf0ebde46b8d4f3
Author: chcunningham <chcunningham@chromium.org>
Date: Thu Aug 02 15:51:17 2018

Initialize SigninManager for ios AccountConsistencyServiceTest

The (Fake)SigninManager should always be initialized before using. This
is made more critical by upcoming changes* that will cause the test to
fail if initialization is not performed.

*https://chromium-review.googlesource.com/c/chromium/src/+/1154985

Bug:  806781 
Change-Id: I06989a895f86b3ca9b1b84760b54ecafdaafdb03
Reviewed-on: https://chromium-review.googlesource.com/1160643
Commit-Queue: Chrome Cunningham (In Paris) <chcunningham@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580204}
[modify] https://crrev.com/4c0a4b4e4fcdb18f1e3710e00cf0ebde46b8d4f3/components/signin/ios/browser/account_consistency_service_unittest.mm

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7e47d3c954e6b0b1752e214756eebd62334e71cf

commit 7e47d3c954e6b0b1752e214756eebd62334e71cf
Author: chcunningham <chcunningham@chromium.org>
Date: Fri Aug 03 10:52:40 2018

Improve FakeSigninManager::DoSignout() - Check IsAuthenticated

This brings the fake a little closer to real SigninManager. The added
behavior is critical to *upcoming tests for the IdentityMager
ClearPrimaryAccount() (aka signout) API.

*https://chromium-review.googlesource.com/c/chromium/src/+/1154985

Bug:  806781 
Change-Id: I4d533e67223dfe4bce6ca26eee7aea6f7cc075fd
Reviewed-on: https://chromium-review.googlesource.com/1160495
Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Chrome Cunningham (In Paris) <chcunningham@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580500}
[modify] https://crrev.com/7e47d3c954e6b0b1752e214756eebd62334e71cf/components/signin/core/browser/fake_signin_manager.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a30be7d24c1af512ae21eb74df991c26694fdbfe

commit a30be7d24c1af512ae21eb74df991c26694fdbfe
Author: chcunningham <chcunningham@chromium.org>
Date: Fri Aug 03 11:12:28 2018

New constructor overloads for FakeSigninManager

Splitting this out of review
https://chromium-review.googlesource.com/c/chromium/src/+/1154985

Bug:  806781 
Change-Id: I0221d901537e39e2c2d66adca254b3ff77df4823
Reviewed-on: https://chromium-review.googlesource.com/1160497
Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Chrome Cunningham (In Paris) <chcunningham@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580502}
[modify] https://crrev.com/a30be7d24c1af512ae21eb74df991c26694fdbfe/components/signin/core/browser/fake_signin_manager.cc
[modify] https://crrev.com/a30be7d24c1af512ae21eb74df991c26694fdbfe/components/signin/core/browser/fake_signin_manager.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9dc792ae009004f77619157c55ef0912b0d0ae00

commit 9dc792ae009004f77619157c55ef0912b0d0ae00
Author: chcunningham <chcunningham@chromium.org>
Date: Fri Aug 03 13:03:29 2018

Implement IdentityManager::ClearPrimaryAccount(...)

Another step on the path to deprecating SigninManager. This method
replaces SigninManager::SignOut*(). See design discussion here:
https://groups.google.com/a/chromium.org/d/msg/identity-service-dev/hNrtJ_nIXJ4/6nMXfIcVBwAJ

Bug:  806781 
Test: New unit tests

Change-Id: I39fe49925c980362b0cdf58db2ce961e107241b6
Reviewed-on: https://chromium-review.googlesource.com/1154985
Commit-Queue: Chrome Cunningham (In Paris) <chcunningham@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580519}
[modify] https://crrev.com/9dc792ae009004f77619157c55ef0912b0d0ae00/services/identity/public/cpp/DEPS
[modify] https://crrev.com/9dc792ae009004f77619157c55ef0912b0d0ae00/services/identity/public/cpp/identity_manager.cc
[modify] https://crrev.com/9dc792ae009004f77619157c55ef0912b0d0ae00/services/identity/public/cpp/identity_manager.h
[modify] https://crrev.com/9dc792ae009004f77619157c55ef0912b0d0ae00/services/identity/public/cpp/identity_manager_unittest.cc