[headless] Use individual aura::WindowTreeHosts per WebContents.

[headless] Use individual aura::WindowTreeHosts per WebContents.

This way, compositing concerns are handled separately per WebContents,
which is required for BeginFrameControl.

BUG=646774
Review-Url: https://codereview.chromium.org/2787373002
Cr-Original-Commit-Position: refs/heads/master@{#461200}
Committed: https://chromium.googlesource.com/chromium/src/+/56b635d784ad0eacbd06e744e43c115e48993a04
Review-Url: https://codereview.chromium.org/2787373002
Cr-Commit-Position: refs/heads/master@{#461414}
Committed: https://chromium.googlesource.com/chromium/src/+/c09e3997a3688d11623054205f4b25e4f8e7dba7

[Eric Seckler, 2017-03-31 16:30:46]

eseckler@chromium.org changed reviewers:
+ skyostil@chromium.org

[Eric Seckler, 2017-03-31 16:30:50]

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

[commit-bot: I haz the power, 2017-03-31 16:31:31]

Dry run: 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, 2017-03-31 16:51:25]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-03-31 16:51:26]

Dry run: Try jobs failed on following builders:
  ios-simulator on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios-simulator/bui...)

[Sami, 2017-03-31 17:53:51]

Great, lgtm!

https://codereview.chromium.org/2787373002/diff/1/headless/lib/browser/headle...
File headless/lib/browser/headless_browser_impl_aura.cc (right):

https://codereview.chromium.org/2787373002/diff/1/headless/lib/browser/headle...
headless/lib/browser/headless_browser_impl_aura.cc:25: // (or at least
BrowserContexts).
N.B. this might be tricky to pull off -- after all even incognito and regular
windows share a clipboard.

[Eric Seckler, 2017-03-31 17:58:51]

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

[commit-bot: I haz the power, 2017-03-31 17:59:15]

Dry run: 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, 2017-03-31 19:11:03]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-03-31 19:11:04]

Dry run: Try jobs failed on following builders:
  mac_chromium_rel_ng on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[Eric Seckler, 2017-03-31 19:18:18]

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

[commit-bot: I haz the power, 2017-03-31 19:19:14]

Dry run: 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, 2017-03-31 19:58:14]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-03-31 19:58:15]

Dry run: This issue passed the CQ dry run.

[Eric Seckler, 2017-03-31 20:03:15]

The CQ bit was checked by eseckler@chromium.org

[commit-bot: I haz the power, 2017-03-31 20:03:57]

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, 2017-03-31 20:10:50]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1490990595930030, "parent_rev":
"95e8edaa74a7d22e21a738700de3f84333cd2dc7", "commit_rev":
"56b635d784ad0eacbd06e744e43c115e48993a04"}

[commit-bot: I haz the power, 2017-03-31 20:11:34]

Description was changed from

==========
[headless] Use individual aura::WindowTreeHosts per WebContents.

This way, compositing concerns are handled separately per WebContents,
which is required for BeginFrameControl.

BUG=646774
==========

to

==========
[headless] Use individual aura::WindowTreeHosts per WebContents.

This way, compositing concerns are handled separately per WebContents,
which is required for BeginFrameControl.

BUG=646774

Review-Url: https://codereview.chromium.org/2787373002
Cr-Commit-Position: refs/heads/master@{#461200}
Committed:
https://chromium.googlesource.com/chromium/src/+/56b635d784ad0eacbd06e744e43c...
==========

[commit-bot: I haz the power, 2017-03-31 20:11:35]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/56b635d784ad0eacbd06e744e43c...

[Timothy Loh, 2017-04-03 01:50:45]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/2792883002/ by timloh@chromium.org.

The reason for reverting is: Suspect this is causing failures of
TargetDomainCreateTwoContexts.RunAsyncTest in
browser_side_navigation_headless_browsertests.

https://build.chromium.org/p/chromium.linux/builders/Linux%20Tests%20%28dbg%2....

[Eric Seckler, 2017-04-03 10:48:38]

Description was changed from

==========
[headless] Use individual aura::WindowTreeHosts per WebContents.

This way, compositing concerns are handled separately per WebContents,
which is required for BeginFrameControl.

BUG=646774

Review-Url: https://codereview.chromium.org/2787373002
Cr-Commit-Position: refs/heads/master@{#461200}
Committed:
https://chromium.googlesource.com/chromium/src/+/56b635d784ad0eacbd06e744e43c...
==========

to

==========
[headless] Use individual aura::WindowTreeHosts per WebContents.

This way, compositing concerns are handled separately per WebContents,
which is required for BeginFrameControl.

BUG=646774

Review-Url: https://codereview.chromium.org/2787373002
Cr-Commit-Position: refs/heads/master@{#461200}
Committed:
https://chromium.googlesource.com/chromium/src/+/56b635d784ad0eacbd06e744e43c...
==========

[Eric Seckler, 2017-04-03 10:49:07]

Fix for patch submitted in https://codereview.chromium.org/2794883002/. Let's
retry this!

[Eric Seckler, 2017-04-03 10:49:13]

The CQ bit was checked by eseckler@chromium.org

[commit-bot: I haz the power, 2017-04-03 10:49:25]

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, 2017-04-03 13:10:41]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1491216553270670, "parent_rev":
"c7ee9b05ad5afbc48f6574e21aacbb7263043924", "commit_rev":
"c09e3997a3688d11623054205f4b25e4f8e7dba7"}

[commit-bot: I haz the power, 2017-04-03 13:11:31]

Description was changed from

==========
[headless] Use individual aura::WindowTreeHosts per WebContents.

This way, compositing concerns are handled separately per WebContents,
which is required for BeginFrameControl.

BUG=646774

Review-Url: https://codereview.chromium.org/2787373002
Cr-Commit-Position: refs/heads/master@{#461200}
Committed:
https://chromium.googlesource.com/chromium/src/+/56b635d784ad0eacbd06e744e43c...
==========

to

==========
[headless] Use individual aura::WindowTreeHosts per WebContents.

This way, compositing concerns are handled separately per WebContents,
which is required for BeginFrameControl.

BUG=646774

Review-Url: https://codereview.chromium.org/2787373002
Cr-Original-Commit-Position: refs/heads/master@{#461200}
Committed:
https://chromium.googlesource.com/chromium/src/+/56b635d784ad0eacbd06e744e43c...
Review-Url: https://codereview.chromium.org/2787373002
Cr-Commit-Position: refs/heads/master@{#461414}
Committed:
https://chromium.googlesource.com/chromium/src/+/c09e3997a3688d11623054205f4b...
==========

[commit-bot: I haz the power, 2017-04-03 13:11:32]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/c09e3997a3688d11623054205f4b...