Adds a factory function to ViewsDelegate for DesktopWindowTreeHost

Adds a factory function to ViewsDelegate for DesktopWindowTreeHost

There is at least one code path (html selects) that creates a
DesktopNativeWidgetAura directly, and relies on
DesktopWindowTreeHost::Create() being called. Problem is we can't wire
up DesktopWindowTreeHost::Create() for ChromeOS (as mus is in a
different compilation unit), so instead this adds another factory
function to ViewsDelegate that if valid DesktopNativeWidgetAura uses
to create the DesktopWindowTreeHost.

BUG=701156
TEST=none
R=erg@chromium.org

Review-Url: https://codereview.chromium.org/2746763007
Cr-Commit-Position: refs/heads/master@{#456768}
Committed: https://chromium.googlesource.com/chromium/src/+/b6eb9203f08cb87cdbaa93f7f6ea4b6b5a9dd41b

[sky, 2017-03-14 17:10:49]

The CQ bit was checked by sky@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-03-14 17:11:22]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Elliot Glaysher, 2017-03-14 17:18:02]

lgtm

[sky, 2017-03-14 17:32:40]

The CQ bit was unchecked by sky@chromium.org

[sky, 2017-03-14 17:32:44]

The CQ bit was checked by sky@chromium.org

[commit-bot: I haz the power, 2017-03-14 17:33:11]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-03-14 18:30:15]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1489512764804630,
"parent_rev": "08614915649c30c0278a9b154825e370b819a6de", "commit_rev":
"b6eb9203f08cb87cdbaa93f7f6ea4b6b5a9dd41b"}

[commit-bot: I haz the power, 2017-03-14 18:31:00]

Description was changed from

==========
Adds a factory function to ViewsDelegate for DesktopWindowTreeHost

There is at least one code path (html selects) that creates a
DesktopNativeWidgetAura directly, and relies on
DesktopWindowTreeHost::Create() being called. Problem is we can't wire
up DesktopWindowTreeHost::Create() for ChromeOS (as mus is in a
different compilation unit), so instead this adds another factory
function to ViewsDelegate that if valid DesktopNativeWidgetAura uses
to create the DesktopWindowTreeHost.

BUG=701156
TEST=none
R=erg@chromium.org
==========

to

==========
Adds a factory function to ViewsDelegate for DesktopWindowTreeHost

There is at least one code path (html selects) that creates a
DesktopNativeWidgetAura directly, and relies on
DesktopWindowTreeHost::Create() being called. Problem is we can't wire
up DesktopWindowTreeHost::Create() for ChromeOS (as mus is in a
different compilation unit), so instead this adds another factory
function to ViewsDelegate that if valid DesktopNativeWidgetAura uses
to create the DesktopWindowTreeHost.

BUG=701156
TEST=none
R=erg@chromium.org

Review-Url: https://codereview.chromium.org/2746763007
Cr-Commit-Position: refs/heads/master@{#456768}
Committed:
https://chromium.googlesource.com/chromium/src/+/b6eb9203f08cb87cdbaa93f7f6ea...
==========

[commit-bot: I haz the power, 2017-03-14 18:31:03]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/chromium/src/+/b6eb9203f08cb87cdbaa93f7f6ea...