Sizer

Resize Chrome windows quickly.Quickly resize the current window to full screen, left half of screen, or right half of screen. Great for those with ChromeOS. Supports mouse actions as well as keyboard shortcuts.

NEW: Keyboard Shortcuts!
Make sure you go to chrome://extensions, click on Keyboard Shortcuts (sometimes called Configure Commands) at the bottom of the page, and set them to whatever you want. Supported actions are Left, Right, and Full Screen.

On many computers, the following defaults will be set:
Left: Alt + H
Right: Alt + L
Full: Alt + J

NOTE: You must click the Sizer icon once to enable the extension each time you start Chrome or it won't accept keyboard shortcuts. There's nothing I can do about this. Conveniently, you can also set a keyboard shortcut to enable the extension in the same place you set the resizing shortcuts.