Attach YUV420 to RGB converter to GLContext

Attach YUV420 to RGB converter to GLContext

This is less hacky than the global lookup table.

Leave the IOSurface-specific parts of the conversion inside
GLImageIOSurface. If this converter is needed on other platforms, this
will make it easier to reuse.

BUG=611551
BUG=
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_optional_gpu_tests_rel;tryserver.chromium.mac:mac_optional_gpu_tests_rel;tryserver.chromium.win:win_optional_gpu_tests_rel

Review URL: https://codereview.chromium.org/1882953006

Cr-Commit-Position: refs/heads/master@{#387986}
(cherry picked from commit dde9e95fb0cd656c952906a630052d560d8a6753)

Committed: https://chromium.googlesource.com/chromium/src/+/8c605e03f431ec403cb34578df279856065d9c7f

[ccameron, 2016-05-20 19:02:36]

Description was changed from

==========
Attach YUV420 to RGB converter to GLContext

This is less hacky than the global lookup table.

Leave the IOSurface-specific parts of the conversion inside
GLImageIOSurface. If this converter is needed on other platforms, this
will make it easier to reuse.

BUG=611551
BUG=
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_optional_gpu_tests_rel;tryserver.chromium.mac:mac_optional_gpu_tests_rel;tryserver.chromium.win:win_optional_gpu_tests_rel

Review URL: https://codereview.chromium.org/1882953006

Cr-Commit-Position: refs/heads/master@{#387986}
(cherry picked from commit dde9e95fb0cd656c952906a630052d560d8a6753)
==========

to

==========
Attach YUV420 to RGB converter to GLContext

This is less hacky than the global lookup table.

Leave the IOSurface-specific parts of the conversion inside
GLImageIOSurface. If this converter is needed on other platforms, this
will make it easier to reuse.

BUG=611551
BUG=
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_optional_gpu_tests_rel;tryserver.chromium.mac:mac_optional_gpu_tests_rel;tryserver.chromium.win:win_optional_gpu_tests_rel

Review URL: https://codereview.chromium.org/1882953006

Cr-Commit-Position: refs/heads/master@{#387986}
(cherry picked from commit dde9e95fb0cd656c952906a630052d560d8a6753)

Committed:
https://chromium.googlesource.com/chromium/src/+/8c605e03f431ec403cb34578df27...
==========

[ccameron, 2016-05-20 19:02:38]

Committed patchset #1 (id:1) manually as
8c605e03f431ec403cb34578df279856065d9c7f.