Added regression test for graphics driver bug affecting end cap rendering in MapsGL (Radar 13239314).
Fixed test description.
Fix a few bugs in ext-draw-buffers.html
Merge pull request #205 from zhenyao/draw_buffers

Fix a few bugs in ext-draw-buffers.html
Addressed Gregg's code review feedback.
Merge pull request #204 from kenrussell/pointcoord

Added regression test for graphics driver bug affecting end cap renderin...