On desktop GL, don't disable vertex attribute 0 when restoring state, or nothing will be drawn during subsequent draw calls.

BUG=138088
TEST=gpu_unittests; revised WebGL conformance test gl-vertex-attrib-zero-issues.html (will be pulled to GPU bots); test cases from bug report


Review URL: https://chromiumcodereview.appspot.com/10808041

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@147584 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed