M58: arc: Set migration success notification pref.

arc: M58: Set migration success notification pref.

The code for M59 or above expects the flag to be already set
if the user started using the new filesystem from the very
beginning they started using the device. M58 needs to set it.

Cherry-pick from the following four changes
1. crrev.com/2788383003 (Only pref name addition)
2. crrev.com/2813633002 (Only BUILD.gn addition)
3. crrev.com/2808353008 (UpdateArcFileSystemCompatibilityPrefIfNeeded)
4. crrev.com/2828213002 (ShowArcMigrationSuccessNotificationIfNeeded)
with unneeded part (disabling ARC or showing notification based on the flag) removed.

BUG=716976
TEST=Manually checked the pref value is set to 2 on M58 Reef.
R=hidehiko@chromium.org

Review-Url: https://codereview.chromium.org/2850123002 .
Cr-Commit-Position: refs/branch-heads/3029@{#788}
Cr-Branched-From: 939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed: https://chromium.googlesource.com/chromium/src/+/47ed318163625a82be7c028f3de0d87a012af4ea

[kinaba, 2017-05-01 05:56:27]

Description was changed from

==========
M58: arc: Set migration success notification pref.

https://codereview.chromium.org/2788383003/ (pref name addition)
https://codereview.chromium.org/2813633002/ (BUILD.gn for notificaiton. h/.cc)
https://codereview.chromium.org/2808353008/
(UpdateArcFileSystemCompatibilityPrefIfNeeded)
https://codereview.chromium.org/2828213002/ ()

BUG=tbd
TEST=manually
==========

to

==========
arc: M58: Set migration success notification pref.

The code for M59 or above expects the flag to be already set
if the user started using the new filesystem from the very
beginning they started using the device. M58 needs to set it.

Cherry-pick from the following four changes
1. crrev.com/2788383003 (Only pref name addition)
2. crrev.com/2813633002 (Only BUILD.gn addition)
3. crrev.com/2808353008 (UpdateArcFileSystemCompatibilityPrefIfNeeded)
4. crrev.com/2828213002 (ShowArcMigrationSuccessNotificationIfNeeded)
with unneeded part (disabling ARC or showing notification based on the flag)
removed.

BUG=716976
TEST=Manually checked the pref value is set to 2 on M58 Reef.
==========

[kinaba, 2017-05-01 05:59:06]

kinaba@chromium.org changed reviewers:
+ hidehiko@chromium.org

[kinaba, 2017-05-01 05:59:06]

I'm thinking about requesting merge of this change.
Hidehiko, could you mind taking a look?

It consists of mechanical cherry-pick with deletion of several lines + comment
update. No code is added.

[hidehiko, 2017-05-01 06:17:03]

LGTM.
Please consult with TPM if this is ok to be merged to release branch.

[kinaba, 2017-05-01 22:11:30]

Description was changed from

==========
arc: M58: Set migration success notification pref.

The code for M59 or above expects the flag to be already set
if the user started using the new filesystem from the very
beginning they started using the device. M58 needs to set it.

Cherry-pick from the following four changes
1. crrev.com/2788383003 (Only pref name addition)
2. crrev.com/2813633002 (Only BUILD.gn addition)
3. crrev.com/2808353008 (UpdateArcFileSystemCompatibilityPrefIfNeeded)
4. crrev.com/2828213002 (ShowArcMigrationSuccessNotificationIfNeeded)
with unneeded part (disabling ARC or showing notification based on the flag)
removed.

BUG=716976
TEST=Manually checked the pref value is set to 2 on M58 Reef.
==========

to

==========
arc: M58: Set migration success notification pref.

The code for M59 or above expects the flag to be already set
if the user started using the new filesystem from the very
beginning they started using the device. M58 needs to set it.

Cherry-pick from the following four changes
1. crrev.com/2788383003 (Only pref name addition)
2. crrev.com/2813633002 (Only BUILD.gn addition)
3. crrev.com/2808353008 (UpdateArcFileSystemCompatibilityPrefIfNeeded)
4. crrev.com/2828213002 (ShowArcMigrationSuccessNotificationIfNeeded)
with unneeded part (disabling ARC or showing notification based on the flag)
removed.

BUG=716976
TEST=Manually checked the pref value is set to 2 on M58 Reef.
R=hidehiko@chromium.org

Review-Url: https://codereview.chromium.org/2850123002 .
Cr-Commit-Position: refs/branch-heads/3029@{#788}
Cr-Branched-From:
939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed:
https://chromium.googlesource.com/chromium/src/+/47ed318163625a82be7c028f3de0...
==========

[kinaba, 2017-05-01 22:11:33]

Committed patchset #2 (id:20001) manually as
47ed318163625a82be7c028f3de0d87a012af4ea.