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i.e., two declared attributes are bound to the same location, then we fail the link.

Many drivers already do this, but not all of them.  For example, mesa does not, and it caused memory corruption actually.  So we do this in chrome command buffer.

BUG=112569
TEST=test case in 112569
R=gman
Review URL: https://chromiumcodereview.appspot.com/9570023

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@124707 0039d316-1c4b-4281-b951-d872f2087c98