Bug fix: Show mouse cursor during full screen share on ChromeOS.

Bug fix: Show mouse cursor during full screen share on ChromeOS.

For R48, On chrome book we found when doing screen share of the
whole screen, the mouse cursor was not captured. This is caused by a bug
we consider the root window as inactive. In this CL, we fix this bug,
and then mouse cursor is shared when doing full screen share.

BUG=568841
Review URL: https://codereview.chromium.org/1527603005

Cr-Commit-Position: refs/heads/master@{#365594}
(cherry picked from commit 65a833af01fe7588e76e18cd28a86aec8980389d)

Committed: https://chromium.googlesource.com/chromium/src/+/7b09337461f354b407002543204778b21fc605bc

[Niklas Enbom, 2015-12-17 19:09:27]

Description was changed from

==========
Bug fix: Show mouse cursor during full screen share on ChromeOS.

For R48, On chrome book we found when doing screen share of the
whole screen, the mouse cursor was not captured. This is caused by a bug
we consider the root window as inactive. In this CL, we fix this bug,
and then mouse cursor is shared when doing full screen share.

BUG=568841

Review URL: https://codereview.chromium.org/1527603005

Cr-Commit-Position: refs/heads/master@{#365594}
(cherry picked from commit 65a833af01fe7588e76e18cd28a86aec8980389d)
==========

to

==========
Bug fix: Show mouse cursor during full screen share on ChromeOS.

For R48, On chrome book we found when doing screen share of the
whole screen, the mouse cursor was not captured. This is caused by a bug
we consider the root window as inactive. In this CL, we fix this bug,
and then mouse cursor is shared when doing full screen share.

BUG=568841

Review URL: https://codereview.chromium.org/1527603005

Cr-Commit-Position: refs/heads/master@{#365594}
(cherry picked from commit 65a833af01fe7588e76e18cd28a86aec8980389d)

Committed:
https://chromium.googlesource.com/chromium/src/+/7b09337461f354b4070025432047...
==========

[Niklas Enbom, 2015-12-17 19:09:29]

Committed patchset #1 (id:1) manually as
7b09337461f354b407002543204778b21fc605bc.