Trac #19035
Signed-off-by: Nicolas Capens

Line loops via DrawArrays were incorrect because the vertex buffer already
has the vertex offset factored in.
Line loops via DrawElements were incorrect because the vertex buffer was
offset by the minIndex. We need to use the same minIndex when rendering
the closing loop.

git-svn-id: https://angleproject.googlecode.com/svn/trunk@892 736b8ea6-26fd-11df-bfd4-992fa37f6226