Unable to reproduce the issue in MacBook Pro Retina 10.11.16 and Mac book air by using chrome reported version #56.0.2901.0.

Steps followed to reproduce the issue are as follows:
-----------
(1) Opened a new window
(2) Pressed Control+Command+F for Fullscreen.
(3) Selected "always hide Toolbar in Fullscreen" from the Menu bar.
(4) Pressed CMD-L 
(5) Observed that cursor moved to fake google bar on the NTP and slide-in animation of the toolbar did not behave abnormally.

Attaching screen cast for reference

mehmet@ - Could you please verify the screen cast and please let us know if anything missed from our side.

Deleted: 659752.mp4 2.3 MB

	659752.mp4 2.3 MB View Download

Hello krajshree@. Thanks for testing it. But that is not what I meant. You have to "deselect" Show always Toolbar in Full Screen and wait until the toolbar disappears. Then you have to press CMD-L or click into the Fake Google search bar. You will notice, that the slide-in animation of the Toolbar will not not smooth in Canary

Please find attached two screencasts: Bug_in_Canary and expected_Chrome_Stable

Deleted: Bug_in_Canary.mov 1.7 MB

Bug_in_Canary.mov 1.7 MB Download

Deleted: expected_Chrome_Stable.mov 1.3 MB

expected_Chrome_Stable.mov 1.3 MB Download

mehmet@ - Thanks a lot for your clarification.

Able to reproduce the issue on Mac OS 10.11.6 using reported version #56.0.2901.0 and latest canary #56.0.2913.3

Bisect Information:
=====================
Good build: 54.0.2840.0
Bad Build : 55.0.2841.0

Change Log URL: 
https://chromium.googlesource.com/chromium/src/+log/f99c4ade4b10c24a59b7bf34de4d7509e7ca8708..2fdf3d97334819323dc2f42e79fb9d897b069ec4

From the above CL it was not sure about the suspect and to identify the issue was a bit difficult. Hence, from http://omahaproxy.appspot.com/ got the below CL

Change Log URL: (From Omahaproxy)
https://chromium.googlesource.com/chromium/src/+log/54.0.2840.0..55.0.2841.0?pretty=fuller&n=10000

From the above change log suspecting below change

Review-Url: https://codereview.chromium.org/2281033003

dcastagna@ - Could you please check whether this is caused with respect to your change, if not please help us in assigning it to the right owner.

No, the regression range is https://chromium.googlesource.com/chromium/src/+log/7a71a1fa240458697111bb6a27aed0804b6b20bd..c8a90c596429c57b9a805d3ec7da56b0ffbcd76c

The culprit is https://codereview.chromium.org/2430403003

Assigning back to spqchan@.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9d140c92c5c769bc3e11c642b0de2d69c4a9f3a3

commit 9d140c92c5c769bc3e11c642b0de2d69c4a9f3a3
Author: spqchan <spqchan@chromium.org>
Date: Thu Dec 01 18:43:52 2016

[Mac] Fullscreen Toolbar Animation Fix

- Fixed the animation so that the toolbar animates in when it's locked
by an object

BUG= 659752 

Review-Url: https://codereview.chromium.org/2542803002
Cr-Commit-Position: refs/heads/master@{#435659}

[modify] https://crrev.com/9d140c92c5c769bc3e11c642b0de2d69c4a9f3a3/chrome/browser/ui/cocoa/fullscreen/fullscreen_toolbar_controller.mm

Your change meets the bar and is auto-approved for M56 (branch: 2924)

Thanks for the fix, we will verify in latest canary. If all looks good please merge ASAP.

FYI:
M56 Beta promotion is scheduled on Dec 6 & RC cut on Monday, Dec 5 @ 4.00 PM PST.

Verified the fix on Mac 10.12.1 using latest canary #57.0.2939.0 as per the comment #0 and #3.

Observed that slide-in animation of the toolbar is smooth as expected.

Hence, the fix is working as expected.

Attaching the screencast for reference.

Adding the verified labels.

Thanks...!!

Deleted: 659752.mp4 1.4 MB

	659752.mp4 1.4 MB View Download

M56 Beta promotion is scheduled soon.Please merge your change ASAP so that we could take it for next Release.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/adb80b7795001c20ab8fbd84dedfebeeafedb6f5

commit adb80b7795001c20ab8fbd84dedfebeeafedb6f5
Author: spqchan <spqchan@chromium.org>
Date: Tue Dec 06 00:07:54 2016

[Mac] Fullscreen Toolbar Animation Fix

- Fixed the animation so that the toolbar animates in when it's locked
by an object

BUG= 659752 

Review-Url: https://codereview.chromium.org/2542803002
Cr-Commit-Position: refs/heads/master@{#435659}
(cherry picked from commit 9d140c92c5c769bc3e11c642b0de2d69c4a9f3a3)

Review URL: https://codereview.chromium.org/2552083002 .

Cr-Commit-Position: refs/branch-heads/2924@{#349}
Cr-Branched-From: 3a87aecc31cd1ffe751dd72c04e5a96a1fc8108a-refs/heads/master@{#433059}

[modify] https://crrev.com/adb80b7795001c20ab8fbd84dedfebeeafedb6f5/chrome/browser/ui/cocoa/fullscreen/fullscreen_toolbar_controller.mm