Fix depth_stencil attachment for framebuffer

Fix depth_stencil attachment for framebuffer

DEPTH_STENCIL_ATTACHMENT is like an alias for DEPTH_ATTACHMENT +
STENCIL_ATTACHMENT in WebGL 2. This CL divides DEPTH_STENCIL_ATTACHMENT
handler into combination of DEPTH_ATTACHMENT and STENCIL_ATTACHMENT.

BUG=295792
Committed: https://crrev.com/bb9b9c4a1d1b5feae4163cb47dc416250fcbbfc8
Cr-Commit-Position: refs/heads/master@{#369303}

[qiankun, 2016-01-13 17:22:41]

qiankun.miao@intel.com changed reviewers:
+ bajones@chromium.org, kbr@chromium.org, yunchao.he@intel.com, zmo@chromium.org

[qiankun, 2016-01-13 17:22:41]

Test is added: https://github.com/KhronosGroup/WebGL/pull/1430. PTAL.

[Ken Russell (switch to Gerrit), 2016-01-13 19:30:42]

Thanks, this LGTM.

[qiankun, 2016-01-13 22:42:19]

The CQ bit was checked by qiankun.miao@intel.com to run a CQ dry run

[commit-bot: I haz the power, 2016-01-13 22:43:42]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1584723003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1584723003/1

[commit-bot: I haz the power, 2016-01-14 00:51:24]

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

[commit-bot: I haz the power, 2016-01-14 00:51:25]

Dry run: Try jobs failed on following builders:
  android_arm64_dbg_recipe on tryserver.chromium.android (JOB_TIMED_OUT, no
build URL)
  android_chromium_gn_compile_dbg on tryserver.chromium.android (JOB_TIMED_OUT,
no build URL)
  android_chromium_gn_compile_rel on tryserver.chromium.android (JOB_TIMED_OUT,
no build URL)
  android_clang_dbg_recipe on tryserver.chromium.android (JOB_TIMED_OUT, no
build URL)
  android_compile_dbg on tryserver.chromium.android (JOB_TIMED_OUT, no build
URL)
  cast_shell_android on tryserver.chromium.android (JOB_TIMED_OUT, no build URL)
  cast_shell_linux on tryserver.chromium.linux (JOB_TIMED_OUT, no build URL)
  chromeos_amd64-generic_chromium_compile_only_ng on tryserver.chromium.linux
(JOB_TIMED_OUT, no build URL)
  chromeos_daisy_chromium_compile_only_ng on tryserver.chromium.linux
(JOB_TIMED_OUT, no build URL)
  chromeos_x86-generic_chromium_compile_only_ng on tryserver.chromium.linux
(JOB_TIMED_OUT, no build URL)
  chromium_presubmit on tryserver.chromium.linux (JOB_TIMED_OUT, no build URL)
  linux_chromium_asan_rel_ng on tryserver.chromium.linux (JOB_TIMED_OUT, no
build URL)
  linux_chromium_chromeos_compile_dbg_ng on tryserver.chromium.linux
(JOB_TIMED_OUT, no build URL)
  linux_chromium_chromeos_ozone_rel_ng on tryserver.chromium.linux
(JOB_TIMED_OUT, no build URL)
  linux_chromium_chromeos_rel_ng on tryserver.chromium.linux (JOB_TIMED_OUT, no
build URL)
  linux_chromium_clobber_rel_ng on tryserver.chromium.linux (JOB_TIMED_OUT, no
build URL)
  linux_chromium_compile_dbg_ng on tryserver.chromium.linux (JOB_TIMED_OUT, no
build URL)
  linux_chromium_gn_chromeos_rel on tryserver.chromium.linux (JOB_TIMED_OUT, no
build URL)
  mac_chromium_compile_dbg_ng on tryserver.chromium.mac (JOB_TIMED_OUT, no build
URL)
  mac_chromium_gn_rel on tryserver.chromium.mac (JOB_TIMED_OUT, no build URL)
  win_chromium_compile_dbg_ng on tryserver.chromium.win (JOB_TIMED_OUT, no build
URL)
  win_chromium_rel_ng on tryserver.chromium.win (JOB_TIMED_OUT, no build URL)
  win_chromium_x64_rel_ng on tryserver.chromium.win (JOB_TIMED_OUT, no build
URL)

[qiankun, 2016-01-14 01:54:55]

The CQ bit was checked by qiankun.miao@intel.com

[commit-bot: I haz the power, 2016-01-14 01:59:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1584723003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1584723003/1

[commit-bot: I haz the power, 2016-01-14 03:25:38]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-01-14 03:26:45]

Description was changed from

==========
Fix depth_stencil attachment for framebuffer

DEPTH_STENCIL_ATTACHMENT is like an alias for DEPTH_ATTACHMENT +
STENCIL_ATTACHMENT in WebGL 2. This CL divides DEPTH_STENCIL_ATTACHMENT
handler into combination of DEPTH_ATTACHMENT and STENCIL_ATTACHMENT.

BUG=295792
==========

to

==========
Fix depth_stencil attachment for framebuffer

DEPTH_STENCIL_ATTACHMENT is like an alias for DEPTH_ATTACHMENT +
STENCIL_ATTACHMENT in WebGL 2. This CL divides DEPTH_STENCIL_ATTACHMENT
handler into combination of DEPTH_ATTACHMENT and STENCIL_ATTACHMENT.

BUG=295792

Committed: https://crrev.com/bb9b9c4a1d1b5feae4163cb47dc416250fcbbfc8
Cr-Commit-Position: refs/heads/master@{#369303}
==========

[commit-bot: I haz the power, 2016-01-14 03:26:46]

Patchset 1 (id:??) landed as
https://crrev.com/bb9b9c4a1d1b5feae4163cb47dc416250fcbbfc8
Cr-Commit-Position: refs/heads/master@{#369303}