Implement dump() for gecko nodes.
Implement dump() for gecko nodes.

MozReview-Commit-ID: I1G65zpQoOm

peterjoel/servo,mattnenterprise/servo,pyfisch/servo,anthgur/servo,KiChjang/servo,pyfisch/servo,CJ8664/servo,mbrubeck/servo,cbrewster/servo,sadmansk/servo,dati91/servo,szeged/servo,avadacatavra/servo,avadacatavra/servo,paulrouget/servo,ConnorGBrewster/servo,upsuper/servo,upsuper/servo,anthgur/servo,dsandeephegde/servo,rnestler/servo,notriddle/servo,mattnenterprise/servo,KiChjang/servo,dsandeephegde/servo,thiagopnts/servo,thiagopnts/servo,mattnenterprise/servo,jimberlage/servo,notriddle/servo,avadacatavra/servo,splav/servo,nnethercote/servo,saneyuki/servo,pyfisch/servo,jimberlage/servo,paulrouget/servo,nnethercote/servo,nnethercote/servo,emilio/servo,jimberlage/servo,pyfisch/servo,mbrubeck/servo,DominoTree/servo,saneyuki/servo,larsbergstrom/servo,rnestler/servo,larsbergstrom/servo,ConnorGBrewster/servo,fiji-flo/servo,DominoTree/servo,rnestler/servo,CJ8664/servo,paulrouget/servo,avadacatavra/servo,saneyuki/servo,nnethercote/servo,notriddle/servo,jimberlage/servo,paulrouget/servo,paulrouget/servo,thiagopnts/servo,sadmansk/servo,mattnenterprise/servo,dati91/servo,saneyuki/servo,thiagopnts/servo,canaltinova/servo,CJ8664/servo,emilio/servo,emilio/servo,fiji-flo/servo,rnestler/servo,mbrubeck/servo,pyfisch/servo,SimonSapin/servo,sadmansk/servo,saneyuki/servo,szeged/servo,mbrubeck/servo,eddyb/servo,splav/servo,fiji-flo/servo,peterjoel/servo,KiChjang/servo,szeged/servo,canaltinova/servo,emilio/servo,emilio/servo,emilio/servo,upsuper/servo,szeged/servo,eddyb/servo,saneyuki/servo,sadmansk/servo,dsandeephegde/servo,nnethercote/servo,notriddle/servo,avadacatavra/servo,paulrouget/servo,rnestler/servo,dsandeephegde/servo,dsandeephegde/servo,rnestler/servo,larsbergstrom/servo,dati91/servo,cbrewster/servo,nnethercote/servo,upsuper/servo,eddyb/servo,SimonSapin/servo,anthgur/servo,paulrouget/servo,nnethercote/servo,splav/servo,paulrouget/servo,notriddle/servo,eddyb/servo,mattnenterprise/servo,SimonSapin/servo,peterjoel/servo,mbrubeck/servo,mattnenterprise/servo,DominoTree/servo,saneyuki/servo,cbrewster/servo,emilio/servo,eddyb/servo,larsbergstrom/servo,splav/servo,pyfisch/servo,mattnenterprise/servo,canaltinova/servo,peterjoel/servo,canaltinova/servo,larsbergstrom/servo,DominoTree/servo,upsuper/servo,cbrewster/servo,ConnorGBrewster/servo,KiChjang/servo,anthgur/servo,larsbergstrom/servo,sadmansk/servo,szeged/servo,CJ8664/servo,dsandeephegde/servo,mattnenterprise/servo,saneyuki/servo,rnestler/servo,upsuper/servo,splav/servo,fiji-flo/servo,mbrubeck/servo,CJ8664/servo,canaltinova/servo,cbrewster/servo,SimonSapin/servo,sadmansk/servo,nnethercote/servo,szeged/servo,thiagopnts/servo,cbrewster/servo,dati91/servo,ConnorGBrewster/servo,pyfisch/servo,KiChjang/servo,fiji-flo/servo,eddyb/servo,avadacatavra/servo,splav/servo,emilio/servo,CJ8664/servo,eddyb/servo,CJ8664/servo,pyfisch/servo,jimberlage/servo,anthgur/servo,emilio/servo,fiji-flo/servo,szeged/servo,KiChjang/servo,canaltinova/servo,sadmansk/servo,thiagopnts/servo,szeged/servo,emilio/servo,canaltinova/servo,splav/servo,nnethercote/servo,cbrewster/servo,jimberlage/servo,saneyuki/servo,DominoTree/servo,KiChjang/servo,thiagopnts/servo,SimonSapin/servo,peterjoel/servo,ConnorGBrewster/servo,SimonSapin/servo,splav/servo,avadacatavra/servo,canaltinova/servo,szeged/servo,notriddle/servo,ConnorGBrewster/servo,szeged/servo,sadmansk/servo,notriddle/servo,eddyb/servo,ConnorGBrewster/servo,nnethercote/servo,notriddle/servo,upsuper/servo,cbrewster/servo,DominoTree/servo,paulrouget/servo,anthgur/servo,dati91/servo,thiagopnts/servo,dsandeephegde/servo,peterjoel/servo,notriddle/servo,fiji-flo/servo,peterjoel/servo,fiji-flo/servo,SimonSapin/servo,paulrouget/servo,peterjoel/servo,DominoTree/servo,SimonSapin/servo,mbrubeck/servo,splav/servo,pyfisch/servo,jimberlage/servo,dati91/servo,DominoTree/servo,CJ8664/servo,dati91/servo,anthgur/servo,peterjoel/servo,upsuper/servo,KiChjang/servo,splav/servo,mbrubeck/servo,dati91/servo,avadacatavra/servo,ConnorGBrewster/servo,larsbergstrom/servo,peterjoel/servo,saneyuki/servo,KiChjang/servo,KiChjang/servo,larsbergstrom/servo,anthgur/servo,DominoTree/servo,notriddle/servo,pyfisch/servo,jimberlage/servo,larsbergstrom/servo,jimberlage/servo,rnestler/servo,dsandeephegde/servo,DominoTree/servo,larsbergstrom/servo