After I build a crx file I drag and drop it into chrome.
I would like to automate it by using a command line argument to google-chrome app.
is there a way to do that?

Thanks!

Yep.
Add load-extension to the command line so it looks something like this...

Code:

"C:\Documents and Settings\Admin\Local Settings\Application Data\Google\Chrome\Application\chrome.exe" --load-extension="C:\Classic Blue Theme - NonAero"

....if you want to test a theme while you have chrome open then add a profile (using user-data-dir) to the command line like this....

Code:

"C:\Documents and Settings\Admin\Local Settings\Application Data\Google\Chrome\Application\chrome.exe" --user-data-dir="c:\Themeing" --load-extension="C:\Classic Blue Theme - NonAero"

...this will make it load chrome using the profile at c:\Themeing (it will create a profile in the directory if there isnt one) and use the theme you pointed it at. This will make chrome load a new instance with the theme so it doesnt interfere with the one your using and is great for taking screenshots as it wont show your bookmarks, history,etc.

If you want to actually install a crx, rather than load an unpacked extension, just add the path to the crx after the path to Chrome, like this:

Code:

"C:\Documents and Settings\{user}\Local Settings\Application Data\Google\Chrome\Application\chrome.exe" C:\extensions\example.crx