WebGL: Be less aggressive about pruning image backed mailboxes.

WebGL: Be less aggressive about pruning image backed mailboxes.

Creating an image backed mailbox can be quite expensive.

BUG=581777
Committed: https://crrev.com/464a53b140272959353caebcee841631868207fe
Cr-Commit-Position: refs/heads/master@{#401489}

[erikchen, 2016-06-22 18:19:10]

erikchen@chromium.org changed reviewers:
+ kbr@chromium.org

[erikchen, 2016-06-22 18:19:11]

kbr: Please review.

[erikchen, 2016-06-22 18:19:16]

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

[commit-bot: I haz the power, 2016-06-22 18:20:03]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2089293002/1

[Ken Russell (switch to Gerrit), 2016-06-22 18:38:09]

Nice. LGTM. How did you find the performance issue? Is it possible to write a
test for it? We have the smoothness.tough_webgl_cases page set available to us
for additions.

[erikchen, 2016-06-22 18:44:28]

On 2016/06/22 18:38:09, Ken Russell wrote:
> Nice. LGTM. How did you find the performance issue? Is it possible to write a
> test for it? We have the smoothness.tough_webgl_cases page set available to us
> for additions.

An appropriate test would use CGSGetPerformanceData() to measure real frame rate
during WebGL tests.
https://bugs.chromium.org/p/chromium/issues/detail?id=603320#c5

I might write this test in the future.

[commit-bot: I haz the power, 2016-06-22 20:10:24]

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

[commit-bot: I haz the power, 2016-06-22 20:10:25]

Dry run: Try jobs failed on following builders:
  win_chromium_rel_ng on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_...)

[erikchen, 2016-06-22 23:33:48]

The CQ bit was checked by erikchen@chromium.org

[commit-bot: I haz the power, 2016-06-22 23:34:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2089293002/1

[commit-bot: I haz the power, 2016-06-23 00:57:15]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-23 00:59:09]

Description was changed from

==========
WebGL: Be less aggressive about pruning image backed mailboxes.

Creating an image backed mailbox can be quite expensive.

BUG=581777
==========

to

==========
WebGL: Be less aggressive about pruning image backed mailboxes.

Creating an image backed mailbox can be quite expensive.

BUG=581777

Committed: https://crrev.com/464a53b140272959353caebcee841631868207fe
Cr-Commit-Position: refs/heads/master@{#401489}
==========

[commit-bot: I haz the power, 2016-06-23 00:59:11]

Patchset 1 (id:??) landed as
https://crrev.com/464a53b140272959353caebcee841631868207fe
Cr-Commit-Position: refs/heads/master@{#401489}