Implement EGL context priority if supported, use in VrShell

Implement EGL context priority if supported, use in VrShell

On devices where the EGL context priority extension is supported,
make this available when creating GL contexts, and use it for VrShell's
VR compositing. The extension is documented here:

https://www.khronos.org/registry/EGL/extensions/IMG/EGL_IMG_context_priority.txt

If the extension is not supported, ignore the requested priority.

As a special case, assume the extension is present if other
VR-specific extensions are available. It was erroneously not reported
as present on Daydream devices even though it was implemented, see
https://github.com/googlevr/gvr-android-sdk/issues/330 .

(This functionality was previously implemented in http://crrev.com/2586803003
but was reverted due to synchronization issues with non-virtualized contexts.
In this new version, only VrShell's private native rendering context uses this
option, so WebGL can continue using virtualized contexts as before.)

BUG=725684
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2902863002
Cr-Commit-Position: refs/heads/master@{#474122}
Committed: https://chromium.googlesource.com/chromium/src/+/9f8c6768f7dff7a712449cc3b526ece8d3ad43a9

[klausw, 2017-05-23 22:24:01]

Description was changed from

==========
Implement EGL context priority if supported, use in VrShell

On devices where the EGL context priority extension is supported,
make this available when creating GL contexts, and use it for VrShell's
VR compositing. The extension is documented here:

https://www.khronos.org/registry/EGL/extensions/IMG/EGL_IMG_context_priority.txt

If the extension is not supported, ignore the requested priority.

As a special case, assume the extension is present if other
VR-specific extensions are available. It was erroneously not reported
as present on Daydream devices even though it was implemented, see
https://github.com/googlevr/gvr-android-sdk/issues/330 .

(This functionality was previously implemented in http://crrev.com/2586803003
but was reverted due to synchronization issues with non-virtualized contexts.
In this new version, only VrShell's private native rendering context uses this
option, so WebGL can continue using virtualized contexts as before.)

BUG=725684
==========

to

==========
Implement EGL context priority if supported, use in VrShell

On devices where the EGL context priority extension is supported,
make this available when creating GL contexts, and use it for VrShell's
VR compositing. The extension is documented here:

https://www.khronos.org/registry/EGL/extensions/IMG/EGL_IMG_context_priority.txt

If the extension is not supported, ignore the requested priority.

As a special case, assume the extension is present if other
VR-specific extensions are available. It was erroneously not reported
as present on Daydream devices even though it was implemented, see
https://github.com/googlevr/gvr-android-sdk/issues/330 .

(This functionality was previously implemented in http://crrev.com/2586803003
but was reverted due to synchronization issues with non-virtualized contexts.
In this new version, only VrShell's private native rendering context uses this
option, so WebGL can continue using virtualized contexts as before.)

BUG=725684
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
==========

[klausw, 2017-05-23 22:27:30]

klausw@chromium.org changed reviewers:
+ bajones@chromium.org, jbauman@chromium.org

[klausw, 2017-05-23 22:27:31]

jbauman@chromium.org: Please review changes in ui/gl
(You had previously LGTMed this as part of http://crrev.com/2586803003 , see
description for details. )

bajones@chromium.org: Please review all of it.

[klausw, 2017-05-23 22:29:44]

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

[commit-bot: I haz the power, 2017-05-23 22:30:53]

Dry run: CQ is trying da patch.

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

[jbauman, 2017-05-23 22:31:28]

ui/gl lgtm

[bajones, 2017-05-23 22:38:53]

On 2017/05/23 22:31:28, jbauman wrote:
> ui/gl lgtm

vr_shell/ LGTM

[commit-bot: I haz the power, 2017-05-24 00:25:08]

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

[commit-bot: I haz the power, 2017-05-24 00:25:09]

Dry run: This issue passed the CQ dry run.

[klausw, 2017-05-24 00:25:30]

The CQ bit was checked by klausw@chromium.org

[commit-bot: I haz the power, 2017-05-24 00:26:49]

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, 2017-05-24 00:32:27]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1495585530045790, "parent_rev":
"f65051935b939d3fed895a045308261f363f395b", "commit_rev":
"9f8c6768f7dff7a712449cc3b526ece8d3ad43a9"}

[commit-bot: I haz the power, 2017-05-24 00:32:42]

Description was changed from

==========
Implement EGL context priority if supported, use in VrShell

On devices where the EGL context priority extension is supported,
make this available when creating GL contexts, and use it for VrShell's
VR compositing. The extension is documented here:

https://www.khronos.org/registry/EGL/extensions/IMG/EGL_IMG_context_priority.txt

If the extension is not supported, ignore the requested priority.

As a special case, assume the extension is present if other
VR-specific extensions are available. It was erroneously not reported
as present on Daydream devices even though it was implemented, see
https://github.com/googlevr/gvr-android-sdk/issues/330 .

(This functionality was previously implemented in http://crrev.com/2586803003
but was reverted due to synchronization issues with non-virtualized contexts.
In this new version, only VrShell's private native rendering context uses this
option, so WebGL can continue using virtualized contexts as before.)

BUG=725684
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
==========

to

==========
Implement EGL context priority if supported, use in VrShell

On devices where the EGL context priority extension is supported,
make this available when creating GL contexts, and use it for VrShell's
VR compositing. The extension is documented here:

https://www.khronos.org/registry/EGL/extensions/IMG/EGL_IMG_context_priority.txt

If the extension is not supported, ignore the requested priority.

As a special case, assume the extension is present if other
VR-specific extensions are available. It was erroneously not reported
as present on Daydream devices even though it was implemented, see
https://github.com/googlevr/gvr-android-sdk/issues/330 .

(This functionality was previously implemented in http://crrev.com/2586803003
but was reverted due to synchronization issues with non-virtualized contexts.
In this new version, only VrShell's private native rendering context uses this
option, so WebGL can continue using virtualized contexts as before.)

BUG=725684
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2902863002
Cr-Commit-Position: refs/heads/master@{#474122}
Committed:
https://chromium.googlesource.com/chromium/src/+/9f8c6768f7dff7a712449cc3b526...
==========

[commit-bot: I haz the power, 2017-05-24 00:32:43]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/9f8c6768f7dff7a712449cc3b526...