Add isMultisampled() to GrRenderTarget. Cleanup MSAA vs smooth lines logic in GrGpuGL.

Skia issue: 178

Review URL: http://codereview.appspot.com/4382041/



git-svn-id: http://skia.googlecode.com/svn/trunk@1067 2bbb7eff-a529-9590-31e7-b0007b416f81
9 files changed