Fixes VertexAttribPointer by allowing null (0) to be passed in.
Fixes VertexAttribPointer by allowing null (0) to be
passed in.

The scary thing is, not setting this causes the GL
driver to trash memory

Review URL: http://codereview.chromium.org/501072

git-svn-id: http://src.chromium.org/svn/trunk/src@34802 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: d189e1a30e5d343696bc31f3d8cc220a1c5d3b2f
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser