Same issue here.
And in full-screen mode some pages cannot do search.
UA: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2799.0 Safari/537.36

Cannot repro on 10.11.5.

Cannot repro on 10.11.6, but mark@ reproed on Sierra. Assigning to spqchan@ for fullscreen stuff :)

I've just found that it is not a Chrome's bug, it's Sierra's bug, because just got the same issue in iTunes.

 Issue 645644  has been merged into this issue.

 Issue 648933  has been merged into this issue.

 Issue 650599  has been merged into this issue.

Can repro on 10.12 release.
Chrome leaves fullscreen when hitting ESC with the Search panel focused.
However, Chrome does not leave fullscreen when the panel is not focused.

 Issue 651209  has been merged into this issue.

 Issue 651418  has been merged into this issue.

 Issue 652048  has been merged into this issue.

 Issue 653232  has been merged into this issue.

CL in review: https://codereview.chromium.org/2398303002/

Seems to be fixed in  55.0.2882.0 dev (64-bit)

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/795ed3707fefc9d39d836545d860f216df620c66

commit 795ed3707fefc9d39d836545d860f216df620c66
Author: spqchan <spqchan@chromium.org>
Date: Mon Oct 10 23:20:47 2016

[Mac] Fix an ESC key issue with the find bar on Sierra

Prevent the window from handling the ESC key when the find bar text is
focused on Sierra.

BUG= 628979 

Review-Url: https://codereview.chromium.org/2398303002
Cr-Commit-Position: refs/heads/master@{#424279}

[modify] https://crrev.com/795ed3707fefc9d39d836545d860f216df620c66/chrome/browser/ui/cocoa/find_bar/find_bar_browsertest.mm
[modify] https://crrev.com/795ed3707fefc9d39d836545d860f216df620c66/chrome/browser/ui/cocoa/find_bar/find_bar_cocoa_controller.mm

I'd consider a merge to M55/M54 as well after this bakes.

Good point. I'll leave this open

 Issue 654504  has been merged into this issue.

 Issue 654533  has been merged into this issue.

Your change meets the bar and is auto-approved for M55 (branch: 2883)

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d9d9cc57897c2bbf7a1c96022403bb9e64bcd0a1

commit d9d9cc57897c2bbf7a1c96022403bb9e64bcd0a1
Author: spqchan <spqchan@chromium.org>
Date: Thu Oct 13 20:57:44 2016

[Mac] Fix an ESC key issue with the find bar on Sierra

Prevent the window from handling the ESC key when the find bar text is
focused on Sierra.

BUG= 628979 

Review-Url: https://codereview.chromium.org/2398303002
Cr-Commit-Position: refs/heads/master@{#424279}
(cherry picked from commit 795ed3707fefc9d39d836545d860f216df620c66)

Review URL: https://codereview.chromium.org/2419783003 .

Cr-Commit-Position: refs/branch-heads/2883@{#94}
Cr-Branched-From: 614d31daee2f61b0180df403a8ad43f20b9f6dd7-refs/heads/master@{#423768}

[modify] https://crrev.com/d9d9cc57897c2bbf7a1c96022403bb9e64bcd0a1/chrome/browser/ui/cocoa/find_bar/find_bar_browsertest.mm
[modify] https://crrev.com/d9d9cc57897c2bbf7a1c96022403bb9e64bcd0a1/chrome/browser/ui/cocoa/find_bar/find_bar_cocoa_controller.mm

Any chance for merging it into M54 since M55 still has about 2 months to arrive? 
Thanks

[Automated comment] Less than 2 weeks to go before stable on M54, manual review required.

Rechecked the issue on MAC 10.11.6 for chrome version 55.0.2883.18. Fix is working as intended. 

1) Installed chrome and launched it in full screen mode
2) Navigated to a website and searched for a string using Find It tool
3) Pressed Esc button and Find it window closed and Browser remained in full screen mode.

Adding TE-verified labels.

Thanks for the fix, we will verify in Mac 10.12 and update the thread.

This is too close to the full stable launch of M54.

Missed the OS version while checking (comment#30)

Rechecked the issue on MAC 10.12 Sierra for chrome version 55.0.2883.20. Fix is working as intended. 

1) Installed chrome and launched it in full screen mode
2) Navigated to a website and searched for a string using Find It tool
3) Pressed Esc button and Find it window closed and Browser remained in full screen mode.

Thanks.!

 Issue 659974  has been merged into this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d9d9cc57897c2bbf7a1c96022403bb9e64bcd0a1

commit d9d9cc57897c2bbf7a1c96022403bb9e64bcd0a1
Author: spqchan <spqchan@chromium.org>
Date: Thu Oct 13 20:57:44 2016

[Mac] Fix an ESC key issue with the find bar on Sierra

Prevent the window from handling the ESC key when the find bar text is
focused on Sierra.

BUG= 628979 

Review-Url: https://codereview.chromium.org/2398303002
Cr-Commit-Position: refs/heads/master@{#424279}
(cherry picked from commit 795ed3707fefc9d39d836545d860f216df620c66)

Review URL: https://codereview.chromium.org/2419783003 .

Cr-Commit-Position: refs/branch-heads/2883@{#94}
Cr-Branched-From: 614d31daee2f61b0180df403a8ad43f20b9f6dd7-refs/heads/master@{#423768}

[modify] https://crrev.com/d9d9cc57897c2bbf7a1c96022403bb9e64bcd0a1/chrome/browser/ui/cocoa/find_bar/find_bar_browsertest.mm
[modify] https://crrev.com/d9d9cc57897c2bbf7a1c96022403bb9e64bcd0a1/chrome/browser/ui/cocoa/find_bar/find_bar_cocoa_controller.mm

 Issue 660440  has been merged into this issue.

 Issue 661477  has been merged into this issue.

[Automated comment] removing mislabelled merge-merged-2840

 Issue 662582  has been merged into this issue.

Issue 662665 has been merged into this issue.

I only recently noticed this behavior.  I went about a year without a MacBook and never noticed this on my old one, but on my new one this has started happening.  Judging by the other comments it looks like this is MacOS 10.12 related, as I am running 10.12.1.

 Issue 668559  has been merged into this issue.

 Issue 669010  has been merged into this issue.

 Issue 671110  has been merged into this issue.

Any chance of a fix for this getting rolled into a Stable patch? Speaking personally, I've fully switched over to Canary specifically because of this bug (which is maybe what Chromium wants, bwahaha). If my experiences have any reflection on our real world users, this is an annoying and noticeable pain point for them.

This was merged to M55/2883 in #36, which is currently being pushed to stable. So the fix should roll out shortly.

Oh excellent :D

 Issue 671654  has been merged into this issue.

 Issue 672061  has been merged into this issue.