Chrome Version       : Canary

What steps will reproduce the problem?

1. Open Files app in the tablet mode
2. Clicks on an image -> the image will be opened by Gallery app
3. Click on the back button at the bottom left corner

What is the expected result?

Either of:

1) Go back to Files app
2) Quit Gallery app and go back to Files app

What happens instead of that?

Nothing happens

Please provide any additional information below. Attach a screenshot if
possible.

weifangsun@ and mcirimele@, what do you think about the expected behavior?