The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/726a66222237491b51c1538854ea20e5df0b89d8

commit 726a66222237491b51c1538854ea20e5df0b89d8
Author: zijiehe <zijiehe@chromium.org>
Date: Fri Jul 15 21:44:27 2016

[Chromoting] Use device::PowerSaveBlocker to block screen saver

Now ScreenCapturers implement their own screen-saver blocking logic, which is
not part of ScreenCapturer functionality. This change adds ScreenSaverBlocker
into It2MeHost or RemotingMe2MeHost as a HostStatusObserver. The
ScreenSaverBlocker implementation uses device::PowerSaverBlocker to do the real
job, and monitors HostStatusMonitor's OnClientConnected and OnClientDisconnected
events to start and stop PowerSaverBlocker. After this change, we can eventually
remove screen-saver blocking logic from various ScreenCapturer implementations.

BUG= 626839 

Review-Url: https://codereview.chromium.org/2080723008
Cr-Commit-Position: refs/heads/master@{#405864}

[modify] https://crrev.com/726a66222237491b51c1538854ea20e5df0b89d8/remoting/host/BUILD.gn
[modify] https://crrev.com/726a66222237491b51c1538854ea20e5df0b89d8/remoting/host/DEPS
[add] https://crrev.com/726a66222237491b51c1538854ea20e5df0b89d8/remoting/host/host_power_save_blocker.cc
[add] https://crrev.com/726a66222237491b51c1538854ea20e5df0b89d8/remoting/host/host_power_save_blocker.h
[add] https://crrev.com/726a66222237491b51c1538854ea20e5df0b89d8/remoting/host/host_power_save_blocker_unittest.cc
[modify] https://crrev.com/726a66222237491b51c1538854ea20e5df0b89d8/remoting/host/remoting_me2me_host.cc
[modify] https://crrev.com/726a66222237491b51c1538854ea20e5df0b89d8/remoting/remoting_host.gypi
[modify] https://crrev.com/726a66222237491b51c1538854ea20e5df0b89d8/remoting/remoting_host_srcs.gypi
[modify] https://crrev.com/726a66222237491b51c1538854ea20e5df0b89d8/remoting/remoting_test.gypi

Hi, AJ,
This is a simple cleanup to existing code, which should have zero behavior impact. But if you happen to find screen-saver takes effect or machine suspends on host machine after a long time idle (no mouse or keyboard activities), please kindly let me know.

Thank you.

Sorry to confuse this bug. We do not block screen-saver from taking effect, but to block screen to power off or machine to suspend.

In that case, this works correctly and I found no regressions. Verified in 54.0.2803.0