The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/214f4ffc34417cfd3940cab8a73a8faf4a81cebb

commit 214f4ffc34417cfd3940cab8a73a8faf4a81cebb
Author: chengx <chengx@chromium.org>
Date: Fri Jun 30 16:06:57 2017

Remove redundant JumpListUpdater::IsEnabled calls

JumpListUpdater::IsEnabled is checked in JumpList constructor. There is
no need to check it again in JumpList member functions as the its state
doesn't change after the JumpList object is constructed.

BUG= 738126 

Review-Url: https://codereview.chromium.org/2954173002
Cr-Commit-Position: refs/heads/master@{#483719}

[modify] https://crrev.com/214f4ffc34417cfd3940cab8a73a8faf4a81cebb/chrome/browser/win/jumplist.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f76319aac84ed31caf40bb206699caa487353c31

commit f76319aac84ed31caf40bb206699caa487353c31
Author: Xi Cheng <chengx@chromium.org>
Date: Mon Jul 10 20:01:37 2017

Retire WinJumplist.DeleteDirectoryContentDuration UMA metric

This metric is no longer needed.

Bug:  738126 
Change-Id: If8baa53178238335d75ccefd8d6ae9065b2d00ad
Reviewed-on: https://chromium-review.googlesource.com/563757
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Patrick Monette <pmonette@chromium.org>
Commit-Queue: Xi Cheng <chengx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485355}
[modify] https://crrev.com/f76319aac84ed31caf40bb206699caa487353c31/chrome/browser/win/jumplist.cc
[modify] https://crrev.com/f76319aac84ed31caf40bb206699caa487353c31/chrome/browser/win/jumplist_file_util.cc
[modify] https://crrev.com/f76319aac84ed31caf40bb206699caa487353c31/chrome/browser/win/jumplist_file_util.h
[modify] https://crrev.com/f76319aac84ed31caf40bb206699caa487353c31/tools/metrics/histograms/histograms.xml

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/51d8ed4661845ddd161953250d445ba777a37a8c

commit 51d8ed4661845ddd161953250d445ba777a37a8c
Author: Xi Cheng <chengx@chromium.org>
Date: Tue Jul 11 17:35:13 2017

Remove metric WinJumplist.UpdateJumpListDuration

This metric has been marked obsolete in histograms.xml. This CL deletes
it in the code.

Bug:  738126 
Change-Id: I8d0f965fa35a6387a765851210e25f6c136572b0
Reviewed-on: https://chromium-review.googlesource.com/566118
Reviewed-by: Patrick Monette <pmonette@chromium.org>
Commit-Queue: Xi Cheng <chengx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485669}
[modify] https://crrev.com/51d8ed4661845ddd161953250d445ba777a37a8c/chrome/browser/win/jumplist.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/30f7b97ee69160736dc3a1087bae880264dafd24

commit 30f7b97ee69160736dc3a1087bae880264dafd24
Author: Xi Cheng <chengx@chromium.org>
Date: Tue Jul 11 18:57:42 2017

Update NotificationTimeInterval, retire AddTasksDuration for JumpList

The metric WinJumplistUpdater.AddTasksDuration is no longer needed.
WinJumplist.NotificationTimeInterval is updated to track the percentage
of the notifications that get coalesced.

Bug:  733034 , 738126 
Change-Id: I92669e5cd261a47df8a3a782ea64072c106a4195
Reviewed-on: https://chromium-review.googlesource.com/565580
Commit-Queue: Xi Cheng <chengx@chromium.org>
Reviewed-by: Patrick Monette <pmonette@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485687}
[modify] https://crrev.com/30f7b97ee69160736dc3a1087bae880264dafd24/chrome/browser/win/jumplist.cc
[modify] https://crrev.com/30f7b97ee69160736dc3a1087bae880264dafd24/chrome/browser/win/jumplist_updater.cc
[modify] https://crrev.com/30f7b97ee69160736dc3a1087bae880264dafd24/tools/metrics/histograms/histograms.xml

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/585cbfe2936465d20143ac6da0b4b2a2a4c56f0b

commit 585cbfe2936465d20143ac6da0b4b2a2a4c56f0b
Author: Xi Cheng <chengx@chromium.org>
Date: Thu Jul 13 02:14:11 2017

Remove unused timers for JumpList

After landing crrev/2956553002 which removes the metrics, these two
elapsed timers are no longer needed.

Bug:  738126 
Change-Id: I04b29e4728cedb9e7f1fc740036d1a6106cbf0a5
Reviewed-on: https://chromium-review.googlesource.com/566990
Reviewed-by: Patrick Monette <pmonette@chromium.org>
Commit-Queue: Xi Cheng <chengx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486222}
[modify] https://crrev.com/585cbfe2936465d20143ac6da0b4b2a2a4c56f0b/chrome/browser/win/jumplist.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/54a292d8c1e6bdeef888bfe7ee8b029c4a82ebc0

commit 54a292d8c1e6bdeef888bfe7ee8b029c4a82ebc0
Author: Xi Cheng <chengx@chromium.org>
Date: Mon Jul 24 17:26:52 2017

Retire metrics RatioAddCategoryTime and NotificationTimeInterval2

These two UMA metrics are retired as they are no longer needed.

Bug:  738126 
Cq-Include-Trybots: master.tryserver.chromium.win:win10_chromium_x64_rel_ng
Change-Id: I77517a1bd3a9ad6681bce58cd9e06aaf57900327
Reviewed-on: https://chromium-review.googlesource.com/582369
Reviewed-by: Patrick Monette <pmonette@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Xi Cheng <chengx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#489010}
[modify] https://crrev.com/54a292d8c1e6bdeef888bfe7ee8b029c4a82ebc0/chrome/browser/win/jumplist.cc
[modify] https://crrev.com/54a292d8c1e6bdeef888bfe7ee8b029c4a82ebc0/tools/metrics/histograms/histograms.xml

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e1af97ee3bc1d6f9b5a9f83d214f3604ca3d26a3

commit e1af97ee3bc1d6f9b5a9f83d214f3604ca3d26a3
Author: Xi Cheng <chengx@chromium.org>
Date: Fri Jul 28 02:35:00 2017

Update the documentation of the JumpList class

This CL documents the states that an update run can be in, the policy of
handling the update notifications, the way an updated JumpList is assembled
and written to the OS, the timeout strategy to help slow machines and so on.

Bug:  738126 
Cq-Include-Trybots: master.tryserver.chromium.win:win10_chromium_x64_rel_ng
Change-Id: I5417905442f3b4997098b0967e7b1368bd281a5d
Reviewed-on: https://chromium-review.googlesource.com/590387
Commit-Queue: Xi Cheng <chengx@chromium.org>
Reviewed-by: Patrick Monette <pmonette@chromium.org>
Cr-Commit-Position: refs/heads/master@{#490217}
[modify] https://crrev.com/e1af97ee3bc1d6f9b5a9f83d214f3604ca3d26a3/chrome/browser/win/jumplist.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/028616d2593c59a14a87b218b4ef716ae77e1e69

commit 028616d2593c59a14a87b218b4ef716ae77e1e69
Author: Xi Cheng <chengx@chromium.org>
Date: Fri Jul 28 20:47:03 2017

Retire OS notification related UMA metrics in JumpList

These metrics are no longer needed as crbug/736530 is fixed.

Bug:  738126 
Change-Id: I497d9192063d16ba57e03924a10e27450ba7dc3a
Reviewed-on: https://chromium-review.googlesource.com/586408
Reviewed-by: Patrick Monette <pmonette@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Xi Cheng <chengx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#490504}
[modify] https://crrev.com/028616d2593c59a14a87b218b4ef716ae77e1e69/chrome/browser/win/jumplist_updater.cc
[modify] https://crrev.com/028616d2593c59a14a87b218b4ef716ae77e1e69/tools/metrics/histograms/histograms.xml