Allow idle/suspend with 3+ monitors attached

Allow idle/suspend with 3+ monitors attached

On Samus it is possible to connect 2 external displays and on other
chromebooks it is possible to connect 2 DisplayLink devices to have
more than 2 monitors. In such cases turning off displays causes the
display configuration to fail and present a "Dear monitor..." message
even though it is possible to turn off these displays.

BUG=627795
TEST=display_unittests and ran on Samus with 2 DisplayLink devices attached.

Review-Url: https://codereview.chromium.org/2152303002
Cr-Commit-Position: refs/heads/master@{#406555}
(cherry picked from commit 310889b982ca44844dbb79b409b874f3267c58fe)

Committed: https://chromium.googlesource.com/chromium/src/+/44265ba65c8d3b5a59d910fa27cbd1454e5c5806

[dnicoara, 2016-07-21 15:33:16]

Description was changed from

==========
Allow idle/suspend with 3+ monitors attached

On Samus it is possible to connect 2 external displays and on other
chromebooks it is possible to connect 2 DisplayLink devices to have
more than 2 monitors. In such cases turning off displays causes the
display configuration to fail and present a "Dear monitor..." message
even though it is possible to turn off these displays.

BUG=627795
TEST=display_unittests and ran on Samus with 2 DisplayLink devices attached.

Review-Url: https://codereview.chromium.org/2152303002
Cr-Commit-Position: refs/heads/master@{#406555}
(cherry picked from commit 310889b982ca44844dbb79b409b874f3267c58fe)
==========

to

==========
Allow idle/suspend with 3+ monitors attached

On Samus it is possible to connect 2 external displays and on other
chromebooks it is possible to connect 2 DisplayLink devices to have
more than 2 monitors. In such cases turning off displays causes the
display configuration to fail and present a "Dear monitor..." message
even though it is possible to turn off these displays.

BUG=627795
TEST=display_unittests and ran on Samus with 2 DisplayLink devices attached.

Review-Url: https://codereview.chromium.org/2152303002
Cr-Commit-Position: refs/heads/master@{#406555}
(cherry picked from commit 310889b982ca44844dbb79b409b874f3267c58fe)

Committed:
https://chromium.googlesource.com/chromium/src/+/44265ba65c8d3b5a59d910fa27cb...
==========

[dnicoara, 2016-07-21 15:33:17]

Committed patchset #1 (id:1) manually as
44265ba65c8d3b5a59d910fa27cbd1454e5c5806.