The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a0627b05a72e3ddd8b9fbdba6ab93717868a9921

commit a0627b05a72e3ddd8b9fbdba6ab93717868a9921
Author: lgcheng <lgcheng@google.com>
Date: Fri Aug 12 17:45:15 2016

arc: Fix ArcPackageSyncableService initialization issue.
ArcPackageSyncableService should not be started before Arc service is
ready.

BUG= 637058 

TEST=Pass sync integration test.
TEST=Manual test. No crash when add second user.

Review-Url: https://codereview.chromium.org/2231593004
Cr-Commit-Position: refs/heads/master@{#411696}

[modify] https://crrev.com/a0627b05a72e3ddd8b9fbdba6ab93717868a9921/chrome/browser/sync/chrome_sync_client.cc
[modify] https://crrev.com/a0627b05a72e3ddd8b9fbdba6ab93717868a9921/chrome/browser/sync/test/integration/migration_test.cc
[add] https://crrev.com/a0627b05a72e3ddd8b9fbdba6ab93717868a9921/chrome/browser/ui/app_list/arc/arc_package_sync_data_type_controller.cc
[add] https://crrev.com/a0627b05a72e3ddd8b9fbdba6ab93717868a9921/chrome/browser/ui/app_list/arc/arc_package_sync_data_type_controller.h
[modify] https://crrev.com/a0627b05a72e3ddd8b9fbdba6ab93717868a9921/chrome/browser/ui/app_list/arc/arc_package_syncable_service.cc
[modify] https://crrev.com/a0627b05a72e3ddd8b9fbdba6ab93717868a9921/chrome/chrome_browser_ui.gypi

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c24c03bb322e34b235fa663d6085a8c3c36db9e1

commit c24c03bb322e34b235fa663d6085a8c3c36db9e1
Author: Elijah Taylor <elijahtaylor@google.com>
Date: Fri Aug 12 21:34:51 2016

arc: Fix ArcPackageSyncableService initialization issue. ArcPackageSyncableService should not be started before Arc service is ready.

BUG= 637058 

TEST=Pass sync integration test.
TEST=Manual test. No crash when add second user.

Review-Url: https://codereview.chromium.org/2231593004
Cr-Commit-Position: refs/heads/master@{#411696}
(cherry picked from commit a0627b05a72e3ddd8b9fbdba6ab93717868a9921)

Review URL: https://codereview.chromium.org/2247523002 .

Cr-Commit-Position: refs/branch-heads/2824@{#7}
Cr-Branched-From: facabd3224aecbcab4bea9daadad31c67488d78c-refs/heads/master@{#410520}

[modify] https://crrev.com/c24c03bb322e34b235fa663d6085a8c3c36db9e1/chrome/browser/sync/chrome_sync_client.cc
[modify] https://crrev.com/c24c03bb322e34b235fa663d6085a8c3c36db9e1/chrome/browser/sync/test/integration/migration_test.cc
[add] https://crrev.com/c24c03bb322e34b235fa663d6085a8c3c36db9e1/chrome/browser/ui/app_list/arc/arc_package_sync_data_type_controller.cc
[add] https://crrev.com/c24c03bb322e34b235fa663d6085a8c3c36db9e1/chrome/browser/ui/app_list/arc/arc_package_sync_data_type_controller.h
[modify] https://crrev.com/c24c03bb322e34b235fa663d6085a8c3c36db9e1/chrome/browser/ui/app_list/arc/arc_package_syncable_service.cc
[modify] https://crrev.com/c24c03bb322e34b235fa663d6085a8c3c36db9e1/chrome/chrome_browser_ui.gypi

ketakid@ for M53 approval as it is Chrome OS change.

[Automated comment] There appears to be on-going work (i.e. bugroid changes), needs manual review.

govind@ should this be approved by you since this is a chrome change?

Before we approve merge to M53, Could you please confirm whether this change is baked/verified in Canary and safe to merge?

It is verified in M54 branch. It can not be verified in Canary because no successful PFQ roll after the patch is landed. Details can be seen at:

http://b/30699487

Approving merge to M53 branch 2785 based on comment #15 and per chat with ketakid@ this imp merge for CrOS. Please merge ASAP. Thank you.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d7e92bc01d0b627a4d66d5ffce4d686f50771075

commit d7e92bc01d0b627a4d66d5ffce4d686f50771075
Author: Josh Horwich <jhorwich@chromium.org>
Date: Tue Aug 16 18:13:12 2016

arc: Fix ArcPackageSyncableService initialization issue.

ArcPackageSyncableService should not be started before Arc service is
ready.

BUG= 637058 

TEST=Pass sync integration test.
TEST=Manual test. No crash when add second user.

TBR=stevenjb@chromium.org, pavely@chromium.org

Review-Url: https://codereview.chromium.org/2231593004
Cr-Commit-Position: refs/heads/master@{#411696}
(cherry picked from commit a0627b05a72e3ddd8b9fbdba6ab93717868a9921)

Review URL: https://codereview.chromium.org/2250753002 .

Cr-Commit-Position: refs/branch-heads/2785@{#626}
Cr-Branched-From: 68623971be0cfc492a2cb0427d7f478e7b214c24-refs/heads/master@{#403382}

[modify] https://crrev.com/d7e92bc01d0b627a4d66d5ffce4d686f50771075/chrome/browser/sync/chrome_sync_client.cc
[modify] https://crrev.com/d7e92bc01d0b627a4d66d5ffce4d686f50771075/chrome/browser/sync/test/integration/migration_test.cc
[add] https://crrev.com/d7e92bc01d0b627a4d66d5ffce4d686f50771075/chrome/browser/ui/app_list/arc/arc_package_sync_data_type_controller.cc
[add] https://crrev.com/d7e92bc01d0b627a4d66d5ffce4d686f50771075/chrome/browser/ui/app_list/arc/arc_package_sync_data_type_controller.h
[modify] https://crrev.com/d7e92bc01d0b627a4d66d5ffce4d686f50771075/chrome/browser/ui/app_list/arc/arc_package_syncable_service.cc
[modify] https://crrev.com/d7e92bc01d0b627a4d66d5ffce4d686f50771075/chrome/chrome_browser_ui.gypi

Chrome OS 54.0.2840.39/8743.42.0