Chrome Version: 55.0.2833.103 (64-bit)
Chrome OS Version: 8872.73.0 (Official Build) stable-channel chel1Chrome OS Platform: HP (?)
Network info: Unknown; likely irrelevant though

Please specify Cr-* of the system to which this bug/feature applies (add
the label below).

Steps To Reproduce:
(1) Select Serbian keyboard layout
(2) Try Ctrl-Alt-? to invoke the help screen.  Does not invoke keyboard layout help.
(3) Try Ctrl-Alt-Shift-(minus sign) (which is where the question mark is on the Serbian keyboard).  Does not invoke keyboard layout help.

Expected Result:
The Ctrl-Alt-? help window appears.

Actual Result:
Nothing appears.

How frequently does this problem reproduce? (Always, sometimes, hard to
reproduce?)
Always.

What is the impact to the user, and is there a workaround? If so, what is
it?
The impact is annoyance -- shortcuts don't work.

Please provide any additional information below. Attach a screen shot or
log if possible.

While regular keys move around based on the keyboard layout selected, it may make sense to *not* move the physical positions of the help keys regardless of the character that one obtains when pressing the particular key.