Fix debug build:  move assertions to GrContext callers, not static callees.
Fix debug build:  move assertions to GrContext callers, not static callees.

Debug build fix; unreviewed.



git-svn-id: e8541e15acce502a64c929015570ad1648e548cd@3329 2bbb7eff-a529-9590-31e7-b0007b416f81

Cue/skia,Cue/skia,mrobinson/skia,metajack/skia,Cue/skia,metajack/skia,mrobinson/skia,Cue/skia,mrobinson/skia,mrobinson/skia,mrobinson/skia,metajack/skia,metajack/skia