test for nested frames through indices.
test for nested frames through indices.

cschroed-usgs/crawljax,ntatsumi/crawljax,cschroed-usgs/crawljax,crawljax/crawljax,bigplus/crawljax,crawljax/crawljax,bigplus/crawljax,fivejjs/crawljax,adini121/crawljax,adini121/crawljax,xujun10110/crawljax,aminmf/crawljax,aminmf/crawljax,ntatsumi/crawljax,cschroed-usgs/crawljax,xujun10110/crawljax,adini121/crawljax,cschroed-usgs/crawljax,fivejjs/crawljax,ntatsumi/crawljax,xujun10110/crawljax,fivejjs/crawljax,aminmf/crawljax,adini121/crawljax,bigplus/crawljax,saltlab/crawljax-graphdb,bigplus/crawljax,crawljax/crawljax,robertzas/crawljax,robertzas/crawljax,saltlab/crawljax-graphdb,fivejjs/crawljax,ntatsumi/crawljax,xujun10110/crawljax,aminmf/crawljax,robertzas/crawljax,robertzas/crawljax,crawljax/crawljax