I use Tinkercad for my project work. On Windows 8.1, I had no issues in accessing the site from Chromium. On the other hand, Chromium on my Ubuntu 16.04 laptop, doesn't support the site. I tried out this solution, but in vain.
I have also installed Google Chrome and things work fine from there. No issues at all...
I performed some tests on chromium and got the following results.
and also,
The chrome://gpu lists the following lines.
About Chromium: Version 55.0.2883.87 Built on Ubuntu , running on Ubuntu 16.04 (64-bit)