Chrome: Save to Drive is a Chrome extension that allows you to save any image, HTML5 video or audio directly to your Google Drive account with a simple right-click.
The process is pretty straightforward. When you come across a file you want to save to your Google Drive, right-click it, select "Save image to Google Drive" and it gets sent over right away.
Unfortunately, you can't pick a folder in your Drive to send it to, and images occasionally have preview problem. But it works well as a way to save a file without sending it to your hard drive.
Save to Drive [Chrome Web Store via Addictive Tips]