Lockdown doesn't work first time.

[fspeirs]

In dfcd453 there is an issue whereby lockdown doesn't work the first time it is tried on a new account. You have to lock, unlock and then lockdown again for it to work. Cause unknown.

[fspeirs]

First-time lockdown works correctly on a fresh Chrome user on macOS. Problem was observed on managed users on a managed Chromebook.

[fspeirs]

Further investigation: the extension works correctly first time if you reload the page once after the extension has been installed.

The previous failure mode was:

Sign into a new managed Google account
Allow the extension to install on an already-loaded Google Doc page.
Try to run the extension - it will fail.

The code in popup.js will work but the message will not be sent to the tab. I wonder if it's because the code in background.js doesn't get executed until the page loads at least once with the extension installed.

[fspeirs]

This problem can be reproduced on macOS with the following steps:

Create new Chrome profile
Load a Google Doc
Install the extension
Try and lock down the page

The result is that the extension does not work. If you unlock, then reload the page, the extension works correctly.