To show Chrome windows (this applies to other apps as well) press: <kbd>Control</kbd>-<kbd>↓</kbd> (arrow down).

Active windows of the current application would be shown larger (if you've multiple monitors, they will show on other screen as well), including minimized at the bottom. 

From there, use arrow keys to switch between different windows and confirm your selection with <kbd>Enter</kbd> or <kbd>Space</kbd> (to switch between all apps press <kbd>Tab</kbd>).

<sub>Above tested on El Capitan (10.11).</sub>