Revert: Remove WindowTreeClientDelegate::GetCaptureClient() and WindowTreeClient::GetCaptureClient()

Revert of Remove WindowTreeClientDelegate::GetCaptureClient() and WindowTreeClient::GetCaptureClient(). (patchset #3 id:40001 of https://codereview.chromium.org/2657873006/ )

Reason for revert:
Prevents reverting https://codereview.chromium.org/2674683002

Original issue's description:
> Remove virtual function WindowTreeClientDelegate::GetCaptureClient() and
> WindowTreeClient::GetCaptureClient().
> 
> This CL is separated out from https://codereview.chromium.org/2626013005
> 
> BUG=676002, 678057
> 
> Review-Url: https://codereview.chromium.org/2657873006
> Cr-Commit-Position: refs/heads/master@{#447680}
> Committed: https://chromium.googlesource.com/chromium/src/+/6c8ec587ec4cf305eafb23d136dd4a34fd825730

TBR=rockot@chromium.org,sadrul@chromium.org,sky@chromium.org,riajiang@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=676002, 678057
Review-Url: https://codereview.chromium.org/2669203002
Cr-Commit-Position: refs/heads/master@{#447755}
Committed: https://chromium.googlesource.com/chromium/src/+/7c809220a7efcf0c26793f7357ad7e69f2804638

[johnme, 2017-02-02 13:18:21]

The CQ bit was checked by johnme@chromium.org

[johnme, 2017-02-02 13:18:21]

Created Revert of Remove WindowTreeClientDelegate::GetCaptureClient() and
WindowTreeClient::GetCaptureClient().

[commit-bot: I haz the power, 2017-02-02 13:19:58]

Description was changed from

==========
Revert of Remove WindowTreeClientDelegate::GetCaptureClient() and
WindowTreeClient::GetCaptureClient(). (patchset #3 id:40001 of
https://codereview.chromium.org/2657873006/ )

Reason for revert:
Prevents reverting https://codereview.chromium.org/2674683002

Original issue's description:
> Remove virtual function WindowTreeClientDelegate::GetCaptureClient() and
> WindowTreeClient::GetCaptureClient().
> 
> This CL is separated out from https://codereview.chromium.org/2626013005
> 
> BUG=676002, 678057
> 
> Review-Url: https://codereview.chromium.org/2657873006
> Cr-Commit-Position: refs/heads/master@{#447680}
> Committed:
https://chromium.googlesource.com/chromium/src/+/6c8ec587ec4cf305eafb23d136dd...

TBR=rockot@chromium.org,sadrul@chromium.org,sky@chromium.org,riajiang@chromiu...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=676002, 678057
==========

to

==========
Revert of Remove WindowTreeClientDelegate::GetCaptureClient() and
WindowTreeClient::GetCaptureClient(). (patchset #3 id:40001 of
https://codereview.chromium.org/2657873006/ )

Reason for revert:
Prevents reverting https://codereview.chromium.org/2674683002

Original issue's description:
> Remove virtual function WindowTreeClientDelegate::GetCaptureClient() and
> WindowTreeClient::GetCaptureClient().
> 
> This CL is separated out from https://codereview.chromium.org/2626013005
> 
> BUG=676002, 678057
> 
> Review-Url: https://codereview.chromium.org/2657873006
> Cr-Commit-Position: refs/heads/master@{#447680}
> Committed:
https://chromium.googlesource.com/chromium/src/+/6c8ec587ec4cf305eafb23d136dd...

TBR=rockot@chromium.org,sadrul@chromium.org,sky@chromium.org,riajiang@chromiu...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=676002, 678057

Review-Url: https://codereview.chromium.org/2669203002
Cr-Commit-Position: refs/heads/master@{#447755}
Committed:
https://chromium.googlesource.com/chromium/src/+/7c809220a7efcf0c26793f7357ad...
==========

[johnme, 2017-02-02 13:25:47]

This landed as https://crrev.com/7c809220a7efcf0c26793f7357ad7e69f2804638