[Merge to 2785] Discard correct drawing buffer

[Merge to 2785] Discard correct drawing buffer

> This partly revert https://codereview.chromium.org/1950053003. On
> platform supported GL_EXT_discard_framebuffer extension, it causes a
> WebGL conformance test regression:
> conformance/state/state-uneffected-after-compositing.html
>
> The root cause is current bound fbo will be discarded other than the
> default fbo. We should discard default fbo correctly.
>
> BUG=628472
>
> Review-Url: https://codereview.chromium.org/2145093003
> Cr-Commit-Position: refs/heads/master@{#405689}
> (cherry picked from commit fd383c4428d3a4e1041425214f001661dca8d173)

Committed: https://chromium.googlesource.com/chromium/src/+/87afbee2e2f123fc576d4274a563f2a628189501

[erikchen, 2016-08-24 17:16:29]

Description was changed from

==========
[Merge to 2785] Discard correct drawing buffer

> This partly revert https://codereview.chromium.org/1950053003. On
> platform supported GL_EXT_discard_framebuffer extension, it causes a
> WebGL conformance test regression:
> conformance/state/state-uneffected-after-compositing.html
>
> The root cause is current bound fbo will be discarded other than the
> default fbo. We should discard default fbo correctly.
>
> BUG=628472
>
> Review-Url: https://codereview.chromium.org/2145093003
> Cr-Commit-Position: refs/heads/master@{#405689}
> (cherry picked from commit fd383c4428d3a4e1041425214f001661dca8d173)
==========

to

==========
[Merge to 2785] Discard correct drawing buffer

> This partly revert https://codereview.chromium.org/1950053003. On
> platform supported GL_EXT_discard_framebuffer extension, it causes a
> WebGL conformance test regression:
> conformance/state/state-uneffected-after-compositing.html
>
> The root cause is current bound fbo will be discarded other than the
> default fbo. We should discard default fbo correctly.
>
> BUG=628472
>
> Review-Url: https://codereview.chromium.org/2145093003
> Cr-Commit-Position: refs/heads/master@{#405689}
> (cherry picked from commit fd383c4428d3a4e1041425214f001661dca8d173)

Committed:
https://chromium.googlesource.com/chromium/src/+/87afbee2e2f123fc576d4274a563...
==========

[erikchen, 2016-08-24 17:16:31]

Committed patchset #1 (id:1) manually as
87afbee2e2f123fc576d4274a563f2a628189501.

[boliu, 2016-08-25 20:10:14]

boliu@chromium.org changed reviewers:
+ boliu@chromium.org

[boliu, 2016-08-25 20:10:15]

err, this was merged without approval, and also not link to the new bug? (google
private crbug.com/639944)

[boliu, 2016-08-25 20:10:46]

On 2016/08/25 20:10:15, boliu wrote:
> err, this was merged without approval, and also not link to the new bug?
(google
> private crbug.com/639944)

oh, merge approval on that other bug, meh..