VR: Add a native UI element scene manager

VR: Add a native UI element scene manager

- Mirror the concept of the HTML scene manager in native.
- Temporarily let both the HTML UI and native code manage elements.
- Future CLs will supply native-driven WebVR security warnings.

BUG=710150
Review-Url: https://codereview.chromium.org/2809143004
Cr-Commit-Position: refs/heads/master@{#464078}
Committed: https://chromium.googlesource.com/chromium/src/+/e4b2c606f4fcdfc6d535165bef73bf9d0a9eb157

[cjgrant, 2017-04-11 14:54:30]

cjgrant@chromium.org changed reviewers:
+ mthiesse@chromium.org

[cjgrant, 2017-04-11 14:54:30]

https://codereview.chromium.org/2809143004/diff/1/chrome/browser/android/vr_s...
File chrome/browser/android/vr_shell/vr_shell.cc (right):

https://codereview.chromium.org/2809143004/diff/1/chrome/browser/android/vr_s...
chrome/browser/android/vr_shell/vr_shell.cc:307:
PostToGlThreadWhenReady(base::Bind(&UiSceneManager::SetWebVRMode,
This is what clang-format does; not how I would have wrapped it.

[acondor_, 2017-04-11 16:06:49]

acondor@google.com changed reviewers:
+ acondor@google.com

[acondor_, 2017-04-11 16:06:50]

lgtm

[mthiesse, 2017-04-11 20:11:57]

lgtm

[cjgrant, 2017-04-12 16:25:24]

The CQ bit was checked by cjgrant@chromium.org

[cjgrant, 2017-04-12 16:25:25]

The patchset sent to the CQ was uploaded after l-g-t-m from acondor@google.com,
mthiesse@chromium.org
Link to the patchset: https://codereview.chromium.org/2809143004/#ps20001
(title: "Rebase.")

[commit-bot: I haz the power, 2017-04-12 16:26:20]

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, 2017-04-12 17:53:19]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1492014324955490,
"parent_rev": "95feea54d56c15f1c3a0b4fc73cfc3579d3e8220", "commit_rev":
"e4b2c606f4fcdfc6d535165bef73bf9d0a9eb157"}

[commit-bot: I haz the power, 2017-04-12 17:54:11]

Description was changed from

==========
VR: Add a native UI element scene manager

- Mirror the concept of the HTML scene manager in native.
- Temporarily let both the HTML UI and native code manage elements.
- Future CLs will supply native-driven WebVR security warnings.

BUG=710150
==========

to

==========
VR: Add a native UI element scene manager

- Mirror the concept of the HTML scene manager in native.
- Temporarily let both the HTML UI and native code manage elements.
- Future CLs will supply native-driven WebVR security warnings.

BUG=710150

Review-Url: https://codereview.chromium.org/2809143004
Cr-Commit-Position: refs/heads/master@{#464078}
Committed:
https://chromium.googlesource.com/chromium/src/+/e4b2c606f4fcdfc6d535165bef73...
==========

[commit-bot: I haz the power, 2017-04-12 17:54:12]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/chromium/src/+/e4b2c606f4fcdfc6d535165bef73...