The Canon 7D, like most “pro” cameras, has so many options for setting the white balance, that it's dizzying. Like almost all digital cameras, you can set the white balance to daylight, shade, cloudy, tungsten, white fluorescent, and flash. You can even set it to whatever you want.
The Canon 7D even has a white balance bracketing. You press the shutter once, and the 7D will take 2 or 3 different photos with a different white balance. The Canon 7D will take the “current” white balance, and bracket with either a blue/amber coloring or magenta/green coloring.