The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/177196c218135882ba6438dfd885fd540be00852

commit 177196c218135882ba6438dfd885fd540be00852
Author: dominickn <dominickn@chromium.org>
Date: Thu Mar 24 04:31:59 2016

Add an experimental keyboard lock, where Esc must be held to exit.

This CL adds an experimental fullscreen with keyboard lock feature,
which can be enabled in chrome://flags. Once toggled, the browser
requires Esc to be held down for at least 1.5 seconds to exit
fullscreen. This is to evaluate how the interaction feels in the browser.

BUG= 595958 

Review URL: https://codereview.chromium.org/1814983003

Cr-Commit-Position: refs/heads/master@{#383031}

[modify] https://crrev.com/177196c218135882ba6438dfd885fd540be00852/chrome/app/generated_resources.grd
[modify] https://crrev.com/177196c218135882ba6438dfd885fd540be00852/chrome/browser/about_flags.cc
[modify] https://crrev.com/177196c218135882ba6438dfd885fd540be00852/chrome/browser/ui/exclusive_access/exclusive_access_bubble_type.cc
[modify] https://crrev.com/177196c218135882ba6438dfd885fd540be00852/chrome/browser/ui/exclusive_access/exclusive_access_bubble_type.h
[modify] https://crrev.com/177196c218135882ba6438dfd885fd540be00852/chrome/browser/ui/exclusive_access/exclusive_access_manager.cc
[modify] https://crrev.com/177196c218135882ba6438dfd885fd540be00852/chrome/browser/ui/exclusive_access/exclusive_access_manager.h
[modify] https://crrev.com/177196c218135882ba6438dfd885fd540be00852/chrome/common/chrome_features.cc
[modify] https://crrev.com/177196c218135882ba6438dfd885fd540be00852/chrome/common/chrome_features.h