Fixes issue that if we don't simulate a disabled vertex attrib 0 (as in the case of running on top of OpenGL ES 2.0 or ANGLE) then we actually have to disable it.
Fixes issue that if we don't simulate a disabled
vertex attrib 0 (as in the case of running on top
of OpenGL ES 2.0 or ANGLE) then we actually have
to disable it.

TEST=updated webgl conformance tests.
BUG=71960

Review URL: http://codereview.chromium.org/6456016

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@74323 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser