According to the latest news which came from the below source Google Chromebooks will soon start listening to the voice commands, just like Google's new operating system Android 4.4 KitKat does. It will like a dream come true for all those who didn't get the taste of Android's new operating system KitKat. You will be able to say "Ok Google" when the App Launcher is pulled up, and then immediately jump into a voice search when it hears the phrase.
According to Google insider François Beaufort , all you'll have to say is "Ok Google" followed by your search command. Its also said that the user will be able to add instructions such as "open Gmail" or "chat with" Amit as well.