Using the per-revision bisect providing the bisect results, 

Good build : 56.0.2916.0
Bad build : 56.0.2917.0

You are probably looking for a change made after 431675 (known good), but no later than 431676 (first known bad).
CHANGELOG URL:
The script might not always return single CL as suspectas some perf builds might get missing due to failure.
  https://chromium.googlesource.com/chromium/src/+log/f437f05e97297947e1308278e380383eb0272b7f..47279775a3f42b190afcb962c917a24beb12612b

From the CL above, assigning the issue to the concern owner 

@spqchan - 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. 

Review-Url: https://codereview.chromium.org/2491343003

Thanks!

I tested this on Canary and it looks like it's fixed. Can you confirm that it's not reproducible on M57?

Actually, I'm testing this right now on M56 and I can't reproduce this either

 yfulgaonkar@ Please verify in latest canary.

With response to comment #3 & 4

Precondition : Please make sure that "Always show toolbar in full screen" option is ticked under "View" menu.

Retested on Mac 56.0.2924.13 dev and 57.0.2938.0 Canary builds and issue is still reproducible. Kindly review an attached screen of both Dev and Canary builds.
Thank you!

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Ah, I see. I'm able to reproduce this. Investigating the issue now

Thanks for the update.

FYI:

M56 Beta promotion is scheduled on Dec 6 & RC cut on Monday, Dec 5 @ 4.00 PM PST.Please ensure to verify the fix and 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/+/72a9bc5acf1c8a203d108a58b69a8f2f8ae17aaf

commit 72a9bc5acf1c8a203d108a58b69a8f2f8ae17aaf
Author: spqchan <spqchan@chromium.org>
Date: Fri Dec 02 22:44:43 2016

[Mac] Fixed permission bubble position in fullscreen

BUG= 670254 

Review-Url: https://codereview.chromium.org/2549863002
Cr-Commit-Position: refs/heads/master@{#436062}

[modify] https://crrev.com/72a9bc5acf1c8a203d108a58b69a8f2f8ae17aaf/chrome/browser/ui/cocoa/browser_window_controller.mm

Please don't merge to 56 before confirming this change in Canary.

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

We will verify the fix in today's canary.

Tested the issue on Latest Canary# 57.0.2943.0 on Mac OS X 10.11.6 and 10.12 1 and observed that the issue is no more reproducible.
Able to see the complete bubble in Full Screen. Hence adding TE-Verified Labels accordingly.
Attaching a screen cast for reference. 
Thank You.

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The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8f0a2fe6fd26d3112db7589dee1d3e8467839a9b

commit 8f0a2fe6fd26d3112db7589dee1d3e8467839a9b
Author: spqchan <spqchan@chromium.org>
Date: Tue Dec 06 19:25:42 2016

[Mac] Fixed permission bubble position in fullscreen

BUG= 670254 

Review-Url: https://codereview.chromium.org/2549863002
Cr-Commit-Position: refs/heads/master@{#436062}
(cherry picked from commit 72a9bc5acf1c8a203d108a58b69a8f2f8ae17aaf)

Review URL: https://codereview.chromium.org/2557533003 .

Cr-Commit-Position: refs/branch-heads/2924@{#360}
Cr-Branched-From: 3a87aecc31cd1ffe751dd72c04e5a96a1fc8108a-refs/heads/master@{#433059}

[modify] https://crrev.com/8f0a2fe6fd26d3112db7589dee1d3e8467839a9b/chrome/browser/ui/cocoa/browser_window_controller.mm

If there is no pending work please tag as fixed, we will verify in next M56 RC.

Tested the issue on Latest Dev# 56.0.2924.21 on Mac OS X 10.11.6 and 10.12.1 and observed that the issue is no more reproducible.
Able to see the complete bubble in Full Screen. Hence adding TE-Verified Labels accordingly.
Attaching a screen shot for reference. 
Thank You.

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