ARC: Add BootType parameter to ReportBootProgress() in metrics.mojom

ARC: Add BootType parameter to ReportBootProgress() in metrics.mojom

ARC has 3 different boot mode. Previously, ARC boot time was recorded
with the same UMA metric like Arc.AndroidBootTime regardless of the
boot mode. This CL allows Chrome to use a dedicated UMA metric for
each boot mode. This is better because a typical boot time is
different for each boot mode.

BUG=726346
TEST=tested with opt-in, ota, and regular ARC boot

Review-Url: https://codereview.chromium.org/2906503003
Cr-Original-Commit-Position: refs/heads/master@{#475184}
Review-Url: https://codereview.chromium.org/2918413002 .
Cr-Commit-Position: refs/branch-heads/3112@{#162}
Cr-Branched-From: b6460e24cf59f429d69de255538d0fc7a425ccf9-refs/heads/master@{#474897}
Committed: https://chromium.googlesource.com/chromium/src/+/ac00b8e7bda9ddd4b081d30d92104f48b62662f8

[Yusuke Sato, 2017-06-05 18:36:37]

Description was changed from

==========
ARC: Add BootType parameter to ReportBootProgress() in metrics.mojom

ARC has 3 different boot mode. Previously, ARC boot time was recorded
with the same UMA metric like Arc.AndroidBootTime regardless of the
boot mode. This CL allows Chrome to use a dedicated UMA metric for
each boot mode. This is better because a typical boot time is
different for each boot mode.

BUG=726346
TEST=tested with opt-in, ota, and regular ARC boot

Review-Url: https://codereview.chromium.org/2906503003
Cr-Commit-Position: refs/heads/master@{#475184}
(cherry picked from commit d6ea165b0d47b5442e7b87cbb0b0fd1006f2a115)
==========

to

==========
ARC: Add BootType parameter to ReportBootProgress() in metrics.mojom

ARC has 3 different boot mode. Previously, ARC boot time was recorded
with the same UMA metric like Arc.AndroidBootTime regardless of the
boot mode. This CL allows Chrome to use a dedicated UMA metric for
each boot mode. This is better because a typical boot time is
different for each boot mode.

BUG=726346
TEST=tested with opt-in, ota, and regular ARC boot

Review-Url: https://codereview.chromium.org/2906503003
Cr-Original-Commit-Position: refs/heads/master@{#475184}
Review-Url: https://codereview.chromium.org/2918413002 .
Cr-Commit-Position: refs/branch-heads/3112@{#162}
Cr-Branched-From:
b6460e24cf59f429d69de255538d0fc7a425ccf9-refs/heads/master@{#474897}
Committed:
https://chromium.googlesource.com/chromium/src/+/ac00b8e7bda9ddd4b081d30d9210...
==========

[Yusuke Sato, 2017-06-05 18:36:38]

Committed patchset #1 (id:1) manually as
ac00b8e7bda9ddd4b081d30d92104f48b62662f8.