yamaguchi@, could you take a look?

I have reverted the change in master that caused this issue.
Since M63 is not branched yet, it will fix this issue in M63.
  https://chromium.googlesource.com/chromium/src.git/+/bc19783572cb7a575421da6a2b67fb54abef0d75

commit bc19783572cb7a575421da6a2b67fb54abef0d75
Author: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
Date: Fri Oct 13 12:34:54 2017

Revert "Do not show tooltip when focus moved as a result of mouse operation."

This reverts commit 10a97df6559061ad5b81e9be7b59dd616fb44fe0.

Reason for revert: It caused regression crbug/774380

Original change's description:
> Do not show tooltip when focus moved as a result of mouse operation.
> 
> Focus is also moved a menu-button after executing or dismissing menu
> by mouse/touch. In such case we should not show the tooltip unlike when
> manually focusing it by keyboard.
> 
> As a side effect, tooltip will not appear when focusing by keyboard
> when button focus is made invisible by  Issue 748489 . It will be resolved
> when  Issue 748489  is fixed.
> 
> Bug:   769593  
> Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
> Change-Id: Ieda9e391117103d91ddad584705173674b3470ae
> Reviewed-on: https://chromium-review.googlesource.com/700116
> Reviewed-by: Naoki Fukino <fukino@chromium.org>
> Commit-Queue: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#507616}

TBR=fukino@chromium.org,yamaguchi@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug:   769593  
Change-Id: Ieb1442e647ff5db03433438b8eb3338276e98853
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Reviewed-on: https://chromium-review.googlesource.com/718217
Reviewed-by: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
Commit-Queue: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#508678}
[modify] https://crrev.com/bc19783572cb7a575421da6a2b67fb54abef0d75/ui/file_manager/file_manager/foreground/elements/files_tooltip.js
[modify] https://crrev.com/bc19783572cb7a575421da6a2b67fb54abef0d75/ui/file_manager/file_manager/foreground/elements/files_tooltip_unittest.js

[Auto-generated comment by a script] We noticed that this issue is targeted for M-63; it appears the fix may have landed after branch point, meaning a merge might be required. Please confirm if a merge is required here - if so add Merge-Request-63 label, otherwise remove Merge-TBD label. Thanks.

Now I found the change was submitted after the branch point.

The patch has been merged.

Here is the automated comment from
https://bugs.chromium.org/p/chromium/issues/detail?id=769593#c10


commit a1e1d8b4c863bd447d75b4c8ecc4ff638b392280
Author: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
Date: Tue Oct 17 01:33:19 2017

Revert "Do not show tooltip when focus moved as a result of mouse operation."

This reverts commit 10a97df6559061ad5b81e9be7b59dd616fb44fe0.

Reason for revert: It caused regression crbug/774380

Original change's description:
> Do not show tooltip when focus moved as a result of mouse operation.
> 
> Focus is also moved a menu-button after executing or dismissing menu
> by mouse/touch. In such case we should not show the tooltip unlike when
> manually focusing it by keyboard.
> 
> As a side effect, tooltip will not appear when focusing by keyboard
> when button focus is made invisible by  Issue 748489 . It will be resolved
> when  Issue 748489  is fixed.
> 
> Bug:  769593 
> Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
> Change-Id: Ieda9e391117103d91ddad584705173674b3470ae
> Reviewed-on: https://chromium-review.googlesource.com/700116
> Reviewed-by: Naoki Fukino <fukino@chromium.org>
> Commit-Queue: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#507616}

TBR=fukino@chromium.org,yamaguchi@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug:  769593 
Change-Id: Ieb1442e647ff5db03433438b8eb3338276e98853
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Reviewed-on: https://chromium-review.googlesource.com/718217
Reviewed-by: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
Commit-Queue: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#508678}(cherry picked from commit bc19783572cb7a575421da6a2b67fb54abef0d75)
Reviewed-on: https://chromium-review.googlesource.com/722459
Cr-Commit-Position: refs/branch-heads/3239@{#24}
Cr-Branched-From: adb61db19020ed8ecee5e91b1a0ea4c924ae2988-refs/heads/master@{#508578}
[modify] https://crrev.com/a1e1d8b4c863bd447d75b4c8ecc4ff638b392280/ui/file_manager/file_manager/foreground/elements/files_tooltip.js
[modify] https://crrev.com/a1e1d8b4c863bd447d75b4c8ecc4ff638b392280/ui/file_manager/file_manager/foreground/elements/files_tooltip_unittest.js