Here's my progress report
To run the file from a flash drive, I used Nexus Media Importer. Turn off data and WiFi, click on the file and choose chrome.
I was also able to copy the file with the bitaddress.org HTML onto my tablet using Media Importer, and then use ES File Explorer to find the file and run the HTML in Chrome Browser.
First I tried clicking the file, but Chrome was not among the options for opening it.
So I did
long press > More > open as > other > chrome