Pepper: Add External_OES texture target to PPB_VideoDecoder docs and example.

Pepper: Add GL_TEXTURE_EXTERNAL_OES texture target to PPB_VideoDecoder docs and example.

GL_TEXTURE_2D is used by x86 non-OSX platforms and by software fallback.
GL_TEXTURE_RECTANGLE_ARB will be used on OSX hardware.
GL_TEXTURE_EXTERNAL_OES is used on ARM ChromeOS.

BUG=281689
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=282674

[bbudge, 2014-07-10 00:29:14]

+Ben for sdk

[dmichael (off chromium), 2014-07-10 16:06:44]

ppapi lgtm

[bbudge, 2014-07-10 17:25:18]

The CQ bit was checked by bbudge@chromium.org

[commit-bot: I haz the power, 2014-07-10 17:26:48]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/bbudge@chromium.org/354763003/20001

[commit-bot: I haz the power, 2014-07-10 20:07:33]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  chromium_presubmit on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/chromium_presubmit/bu...)

[commit-bot: I haz the power, 2014-07-10 20:13:55]

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

[commit-bot: I haz the power, 2014-07-10 20:13:56]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/chromium_presubmit/bu...)

[binji, 2014-07-11 17:02:35]

lgtm, make sure to ran SDK trybots (the CQ doesn't run them)

[bbudge, 2014-07-11 19:51:12]

The CQ bit was checked by bbudge@chromium.org

[commit-bot: I haz the power, 2014-07-11 19:52:00]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/bbudge@chromium.org/354763003/20001

[commit-bot: I haz the power, 2014-07-11 20:01:49]

Change committed as 282674