Chrome Version       : 53.0.2785.116 and 55.0.2879.0 canary

What steps will reproduce the problem?
(1) Open timeline and load page with very slow function calls
(2) Notice that the function calls are split into several small boxes and that the function names are not readable (unless you hover over the box)

What is the expected result?

Since the function is called only once, there should be also just one box instead of several small boxes.

What happens instead?

Lots of small boxes, function name not readable.

Please provide any additional information below. Attach a screenshot if
possible.

I have attached:
* test.html file to reproduce the problem
* timeline.png which shows the problem in the timeline

I have created these files for #652332 which is why they contain an unrelated event handler as well (please ignore).
 

Deleted: timeline.png 117 KB

	timeline.png 117 KB View Download

Deleted: test.html 310 bytes

test.html 310 bytes View Download