gles.moveClientVBsToVAs: Write VAP cmds on draw thread. (#1220)
gles.moveClientVBsToVAs: Write VAP cmds on draw thread. (#1220)

The calls to glVertexAttribPointer may have come from a thread that has since unbound the context. Just use the thread that is making the draw call.

Issue: #1205

dsrbecky/gapid,google/agi,dsrbecky/gapid,dsrbecky/gapid,Qining/gapid,Qining/gapid,pmuetschard/gapid,pmuetschard/gapid,google/gapid,Qining/gapid,baldwinn860/gapid,google/gapid,baldwinn860/gapid,google/gapid,google/gapid,google/agi,dsrbecky/gapid,google/gapid,baldwinn860/gapid,pmuetschard/gapid,google/agi,baldwinn860/gapid,dsrbecky/gapid,Qining/gapid,dsrbecky/gapid,dsrbecky/gapid,pmuetschard/gapid,google/agi,Qining/gapid,google/agi,pmuetschard/gapid,dsrbecky/gapid,baldwinn860/gapid,google/agi,google/agi,baldwinn860/gapid,google/gapid,baldwinn860/gapid,google/gapid,Qining/gapid,google/agi,pmuetschard/gapid,google/gapid,baldwinn860/gapid,pmuetschard/gapid,pmuetschard/gapid,Qining/gapid,Qining/gapid