Chrome Version: 57.0.2951.0 dev
OS: ChromeOS

What steps will reproduce the problem?
(0) Get a touch-screen Chromebook.
(1) Open a window.
(2) Open some tabs (I have 16 open right now).
(3) Pin some tabs (I have three pinned).
(4) Drag down from top of screen, to show the tab bar.
(5) Tap one of the pinned tabs.
(6) Drag down again, to re-show the tab bar.

What is the expected result?

Observe that the tabs are rearranged so that a load of them overlap one another, to the left end of the tab strip.

What happens instead?

Expect that selecting a pinned tab doesn't cause any other tabs to be rearranged.