Chrome Version: 56.0.2924.26 dev
OS: Chrome

What steps will reproduce the problem?
(1) Use a Caroline (though this may repro on more devices)
(2) Hide the shelf
(3) Swipe up quickly from the bottom of the screen

What is the expected result?
The shelf is shown

What happens instead?
Shelf is not shown; instead touch events get passed to whatever app is open

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For graphics-related bugs, please copy/paste the contents of the about:gpu
page at the end of this report.