update some sample files to not use obsolete SkShaderExtras.h git-svn-id: http://skia.googlecode.com/svn/trunk@46 2bbb7eff-a529-9590-31e7-b0007b416f81
git-svn-id: http://skia.googlecode.com/svn/trunk@27 2bbb7eff-a529-9590-31e7-b0007b416f81