Do this by going up to the Omnibox (where the website URL is across the top) and right clicking in it. Then choose "Edit Search Engines".
Scroll to the bottom of the window that comes up and you will see an empty box - a place to add a new search engine.
Google Drive: https://drive.google.com/#search/%s
Chrome Web Store: https://chrome.google.com/webstore/search/%s
When you are done with one, click "Done". Then you can go up, right click in the Omnibox again, and choose "Edit Search Engines" to add your second one.
Now, no matter what website I'm currently on, I can go to the Omnibox and type in dr and hit spacebar. Then it will be ready for me to search Google Drive. I can do the same thing by typing cws and then hitting spacebar. Now I can type in what I want to search for in the Chrome Web Store. It's a beautiful, time saving thing! You can do this for most any website - Amazon, YouTube, Bible Gateway. Just hit me up for the URL query code for those if you are interested!