Make the width of block customizable by its parent
Make the width of block customizable by its parent

Add a 'IS_FLEX' flag to bitflags of block flow, and when it is set, the
block will use the inline size and margins set by its parent.

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