First of all you have to enable the "Emulation" view in the console drawer. Open the Developer Tools and click the settings icon:
Next, switch to the "General" panel and enable "Show emulation view in console drawer"
Now close the settings and press the ESC (Escape Key) and switch to the "Emulation" Panel (2). The "Sensors" menu (3) let's you enable the "Emulate touch screen" (4) checkbox. That's it!