gpu: Benchmark GL_RED instead of GL_LUMINANCE on OpenGL ES3.

gpu: Benchmark GL_RED instead of GL_LUMINANCE on OpenGL ES3.

This patch tests GL_LUMINANCE only when OpenGL is not ES3
and tests GL_RED when on OpengGL ES3.

This change should allow crrev.com/1022603002 to run on Android perf
bots. Without this patch crrev.com/1022603002 fails on perf bots because
glTextureStorage2D doesn't always accept GL_LUMINANCE8 as
internalformat.

glTextureStorage2D has been added to OpenGL ES3 and it's available
as an extension (GL_{EXT,ARB}_texture_storage) prior to that.
If glTextureStorage2D is availabe via the extension it accepts
GL_LUMINANCE8_EXT as internal format, otherwise it doesn't.

BUG=468748
Committed: https://crrev.com/2208da11bfcabfa5bf0e05fbe614a04715f08b4d
Cr-Commit-Position: refs/heads/master@{#321462}

[Daniele Castagna, 2015-03-19 19:45:24]

dcastagna@chromium.org changed reviewers:
+ reveman@chromium.org

[reveman, 2015-03-19 21:42:30]

lgtm

[Daniele Castagna, 2015-03-19 22:12:09]

The CQ bit was checked by dcastagna@chromium.org

[commit-bot: I haz the power, 2015-03-19 22:12:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1022923002/1

[commit-bot: I haz the power, 2015-03-19 23:00:41]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-19 23:01:17]

Patchset 1 (id:??) landed as
https://crrev.com/2208da11bfcabfa5bf0e05fbe614a04715f08b4d
Cr-Commit-Position: refs/heads/master@{#321462}