KhronosGroup/WebGL — pull request #591 by jamiemadill (2014-06-16 19:29:58+00:00)
Title: Add ANGLE bug test for variables with "dx_".

Variables starting with "dx_" are treated specially in certain
versions of ANGLE, causing a link error in some shaders. The bug
only presents in Firefox, because of Chromium's variable hashing
scheme.