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This test becomes invalid with the upcoming angle changes. This test
expects webgle_dot_emu to be always there in translated shader source
but with the constant folding implemented in ANGLE for built-in
'dot', 'dot' function call will be replaced by actual result when all
the arguments are constant expressions and webgl_dot_emu will no
longer be there in translated shader source.

R=zmo

Review URL: https://codereview.chromium.org/1161463013

Cr-Commit-Position: refs/heads/master@{#333093}