Add NULL GL context implementation. Use in bench (-nullgl) and SampleApp (backspace key)

Review URL: http://codereview.appspot.com/5303080/


git-svn-id: http://skia.googlecode.com/svn/trunk/gyp@2545 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed