attached the "after" screenshot from https://codereview.chromium.org/1999593002

Deleted: emulator_after.png 406 KB

	emulator_after.png 406 KB View Download

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a658634192afc565b2d1cf703234579fe2f73e0a

commit a658634192afc565b2d1cf703234579fe2f73e0a
Author: michaelpg <michaelpg@chromium.org>
Date: Sat May 21 04:48:06 2016

Update chrome://device-emulator with newer Polymer guidelines

Lots of changes from recent Polymer updates. Also freshen up the style
a little, make dialogs close on Escape, remove dependency on iron-icons.

New screenshot (not much changed visually) in the bug.

Note that this only applies to non-official Debug builds.

After this I'll add new settings, e.g. pointer settings.

BUG= 613416 
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/1999593002
Cr-Commit-Position: refs/heads/master@{#395248}

[modify] https://crrev.com/a658634192afc565b2d1cf703234579fe2f73e0a/chrome/browser/browser_resources.grd
[modify] https://crrev.com/a658634192afc565b2d1cf703234579fe2f73e0a/chrome/browser/resources/chromeos/emulator/audio_settings.html
[modify] https://crrev.com/a658634192afc565b2d1cf703234579fe2f73e0a/chrome/browser/resources/chromeos/emulator/audio_settings.js
[modify] https://crrev.com/a658634192afc565b2d1cf703234579fe2f73e0a/chrome/browser/resources/chromeos/emulator/battery_settings.html
[modify] https://crrev.com/a658634192afc565b2d1cf703234579fe2f73e0a/chrome/browser/resources/chromeos/emulator/battery_settings.js
[modify] https://crrev.com/a658634192afc565b2d1cf703234579fe2f73e0a/chrome/browser/resources/chromeos/emulator/bluetooth_settings.html
[modify] https://crrev.com/a658634192afc565b2d1cf703234579fe2f73e0a/chrome/browser/resources/chromeos/emulator/bluetooth_settings.js
[modify] https://crrev.com/a658634192afc565b2d1cf703234579fe2f73e0a/chrome/browser/resources/chromeos/emulator/device_emulator.html
[delete] https://crrev.com/495f126aa1c0f77e8b5a99fc0ea741501404ae7a/chrome/browser/resources/chromeos/emulator/device_emulator.js
[add] https://crrev.com/a658634192afc565b2d1cf703234579fe2f73e0a/chrome/browser/resources/chromeos/emulator/device_emulator_pages.html
[add] https://crrev.com/a658634192afc565b2d1cf703234579fe2f73e0a/chrome/browser/resources/chromeos/emulator/device_emulator_pages.js
[add] https://crrev.com/a658634192afc565b2d1cf703234579fe2f73e0a/chrome/browser/resources/chromeos/emulator/icons.html
[delete] https://crrev.com/495f126aa1c0f77e8b5a99fc0ea741501404ae7a/chrome/browser/resources/chromeos/emulator/shared_styles.css
[add] https://crrev.com/a658634192afc565b2d1cf703234579fe2f73e0a/chrome/browser/resources/chromeos/emulator/shared_styles.html
[modify] https://crrev.com/a658634192afc565b2d1cf703234579fe2f73e0a/chrome/browser/ui/webui/chromeos/emulator/device_emulator_message_handler.cc
[modify] https://crrev.com/a658634192afc565b2d1cf703234579fe2f73e0a/chrome/browser/ui/webui/chromeos/emulator/device_emulator_message_handler.h
[modify] https://crrev.com/a658634192afc565b2d1cf703234579fe2f73e0a/chrome/browser/ui/webui/chromeos/emulator/device_emulator_ui.cc

@michaelpg Hi, trying to verify this bug. 
When I try to open chrome://device-emulator it says "Site cannot be reached. ERR_INVALID_URL"

Am I missing something here?

This is a debug-only UI; it does not need verification, and only appears in Debug builds when not running on a Chrome OS device (ie, on Linux).

michaelpg@ Thanks for the update.

Closing the bug as per #5