Chrome’s Developer Tools include a Device Emulator 
to simulate how your application looks and performs on mobile devices.
It can emulate:
- mobile viewports adjust the screen size to a specific device and change its orientation
- mobile performance select from three tiers of device:
- default - no adjustment
- mid-tier - fast 3G connection and weak CPU
- low-end - slow 3G connection and very weak CPU
- a touch interface trigger touch events
- geolocation change and disable device location