Chrome Version: 57.0.2987.11 dev
Platform: 9202.7.0 (Official build) dev-channel peach_pi


What steps will reproduce the problem?
1. Connect Device and External monitor.
2. Boot the device with external monitor connected.
3. Login to the device.
4. Open a browser in the extended display screen
5. Switch to Mirror (ctrl + f4) and back to Extended mode

What is the expected result?
Device should not hang

What happens instead?
Systems hangs up (observed only once, reporting for tracking purpose)

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For graphics-related bugs, please copy/paste the contents of the about:gpu
page at the end of this report.