ENVIRONMENT and STATS
For syncing clients:
From chrome:chrome 59.0.3071.125,
            Android 5.1.1;A05510 Build/LMY49J
From about:

REPRO STEPS:

I can reproduce this issue with an example

1.Open the below given link
http://googleweblight.com/i?u=http://studentsfocus.com/cs6403-se-notes-software-engineering-lecture-notes-cse-4th-sem-anna-university/&grqid=6qMnXuoD&hl=en-IN&geid=1006

2.you can see different download links of some PDF s.Click on all the "download here" links.

3.Now the downloading will start.

4.you can see that each one will automatically open according to the order in which they  finish their downloading.(here is the problem)

5.Consider the situation,your first one is finished downloading. Then it will open the PDF automatically. While you read through the PDF the second one will get complete downloading and it will also open it automatically by switching to new PDF content.This is the problem.By this one can read only the last downloaded PDF .

ACTUAL RESULTS


EXPECTED RESULTS
Auto viewing documents after download is a good option.but once it is opened,only after exiting from that view next one should be viewed or showed for user.ie,the downloaded documents should be queued for auto viewing 

ADDITIONAL INFO