Chrome Version: 59.0.3071.91/9460.60.0 Beta-channel Candy,Daisy,Peppy,Jerry & Minnie
OS: Chrome

What steps will reproduce the problem?
1)Click on App launcher and pin more than 20-30 apps to shelf -> At shelf we can see up to 15 apps
2)Now for remaining apps click on Upward arrow such that other pinned apps are seen  -> We need to scroll horizontally to see all apps
3)Observe Horizontal scrollbar is seen missing(Please refer Video)

Expected: Horizontal scrollbar should be seen insisting that there are more pinned apps 
Actual: Instead Horizontal scrollbar is seen missing 

This is Non-Regression issue seen from M-56

Note: Issue is also seen in Latest M-61

@tdanderson : Please confirm the Issue
 

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