arc: kArcCompatibleFilesystemChosen pref to local state and integer.

arc: kArcCompatibleFilesystemChosen pref to local state and integer.

For bug 709893,
It needs to be established before profile's KeyedService starts working,
hence is moved to the local state which can be initialized earlier.

For bug 711095,
to implement a one-time UI to show the success of navigation to the user,
this value needs to be tri-state (notyet, done, done-and-notified).
Taking this opportunity to move to local state, this CL changes the type
of the pref from boolean to integer as well.

BUG=709893
BUG=711095
TEST=ChromeArcUtilTest
TEST=Manually checked MediaView in Files app is working on the first run.

Review-Url: https://codereview.chromium.org/2808353008
Cr-Commit-Position: refs/heads/master@{#464699}
(cherry picked from commit 6ea2f510147f3bca05aea7024752e95dcf559912)

Review-Url: https://codereview.chromium.org/2834323002 .
Cr-Commit-Position: refs/branch-heads/3071@{#150}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/534138b6fa2d1f08dda69114567ec27cde498cd0

[kinaba, 2017-04-24 00:47:32]

Description was changed from

==========
arc: kArcCompatibleFilesystemChosen pref to local state and integer.

For bug 709893,
It needs to be established before profile's KeyedService starts working,
hence is moved to the local state which can be initialized earlier.

For bug 711095,
to implement a one-time UI to show the success of navigation to the user,
this value needs to be tri-state (notyet, done, done-and-notified).
Taking this opportunity to move to local state, this CL changes the type
of the pref from boolean to integer as well.

BUG=709893
BUG=711095
TEST=ChromeArcUtilTest
TEST=Manually checked MediaView in Files app is working on the first run.

Review-Url: https://codereview.chromium.org/2808353008
Cr-Commit-Position: refs/heads/master@{#464699}
(cherry picked from commit 6ea2f510147f3bca05aea7024752e95dcf559912)
==========

to

==========
arc: kArcCompatibleFilesystemChosen pref to local state and integer.

For bug 709893,
It needs to be established before profile's KeyedService starts working,
hence is moved to the local state which can be initialized earlier.

For bug 711095,
to implement a one-time UI to show the success of navigation to the user,
this value needs to be tri-state (notyet, done, done-and-notified).
Taking this opportunity to move to local state, this CL changes the type
of the pref from boolean to integer as well.

BUG=709893
BUG=711095
TEST=ChromeArcUtilTest
TEST=Manually checked MediaView in Files app is working on the first run.

Review-Url: https://codereview.chromium.org/2808353008
Cr-Commit-Position: refs/heads/master@{#464699}
(cherry picked from commit 6ea2f510147f3bca05aea7024752e95dcf559912)

Review-Url: https://codereview.chromium.org/2834323002 .
Cr-Commit-Position: refs/branch-heads/3071@{#150}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/534138b6fa2d1f08dda69114567e...
==========

[kinaba, 2017-04-24 00:47:34]

Committed patchset #1 (id:1) manually as
534138b6fa2d1f08dda69114567ec27cde498cd0.