(internal bug: b/62061882)

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3f9e6d5f978cfe76acff68fb181730b26a4612b1

commit 3f9e6d5f978cfe76acff68fb181730b26a4612b1
Author: khmel <khmel@google.com>
Date: Sat Jun 03 02:59:03 2017

arc: Provide metric to monitor Play Store window is shown time.

This adds UMA to track time between initial ARC OptIn and moment
when the first Play Store window is shown.

BUG= 728880 
TEST=Manually for managed/unmanaged accounts. Confirmed that
     metric is updted only for initial ARC boot.

Change-Id: I2b988f039ec709a4d9c369a27ccd01777b688028
Reviewed-on: https://chromium-review.googlesource.com/522442
Commit-Queue: Yury Khmel <khmel@google.com>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#476874}
[modify] https://crrev.com/3f9e6d5f978cfe76acff68fb181730b26a4612b1/chrome/browser/chromeos/arc/arc_optin_uma.cc
[modify] https://crrev.com/3f9e6d5f978cfe76acff68fb181730b26a4612b1/chrome/browser/chromeos/arc/arc_optin_uma.h
[modify] https://crrev.com/3f9e6d5f978cfe76acff68fb181730b26a4612b1/chrome/browser/ui/ash/launcher/arc_app_window_launcher_controller.cc
[modify] https://crrev.com/3f9e6d5f978cfe76acff68fb181730b26a4612b1/chrome/browser/ui/ash/launcher/arc_app_window_launcher_controller.h
[modify] https://crrev.com/3f9e6d5f978cfe76acff68fb181730b26a4612b1/tools/metrics/histograms/histograms.xml

Your change meets the bar and is auto-approved for M60. Please go ahead and merge the CL to branch 3112 manually. Please contact milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), josafat@(ChromeOS), bustamante@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5e6cd66d550e0942591b62710c8b429d65d65dbc

commit 5e6cd66d550e0942591b62710c8b429d65d65dbc
Author: khmel <khmel@chromium.org>
Date: Tue Jun 06 19:36:16 2017

[Merge M60] arc: Provide metric to monitor Play Store window is shown time.

This adds UMA to track time between initial ARC OptIn and moment
when the first Play Store window is shown.

BUG= 728880 
TEST=Manually for managed/unmanaged accounts. Confirmed that
     metric is updted only for initial ARC boot.
TBR=yusukes@chromium.org,oshima@chromium.org,isherman@chromium.org
NOTRY=true
NOPRESUBMIT=true

Change-Id: I2b988f039ec709a4d9c369a27ccd01777b688028
Reviewed-on: https://chromium-review.googlesource.com/522442
Commit-Queue: Yury Khmel <khmel@google.com>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#476874}
Review-Url: https://codereview.chromium.org/2922383002
Cr-Commit-Position: refs/branch-heads/3112@{#199}
Cr-Branched-From: b6460e24cf59f429d69de255538d0fc7a425ccf9-refs/heads/master@{#474897}

[modify] https://crrev.com/5e6cd66d550e0942591b62710c8b429d65d65dbc/chrome/browser/chromeos/arc/arc_optin_uma.cc
[modify] https://crrev.com/5e6cd66d550e0942591b62710c8b429d65d65dbc/chrome/browser/chromeos/arc/arc_optin_uma.h
[modify] https://crrev.com/5e6cd66d550e0942591b62710c8b429d65d65dbc/chrome/browser/ui/ash/launcher/arc_app_window_launcher_controller.cc
[modify] https://crrev.com/5e6cd66d550e0942591b62710c8b429d65d65dbc/chrome/browser/ui/ash/launcher/arc_app_window_launcher_controller.h
[modify] https://crrev.com/5e6cd66d550e0942591b62710c8b429d65d65dbc/tools/metrics/histograms/histograms.xml