I think this is a manifestation of the signing keys issue -- Android won't take the update to the APK if the keys don't match, and we currently use different keys for different browsers.

Sam you are right.

The WebAPK for tests.peter.sh for Chrome canary and Chrome dev has:
- the same package name (This is why Chrome does not realize that a WebAPK is already installed)
- different signing keys (This is why the install fails)

We should either use the same signing keys or use different package names for WebAPKs generated by each browser