layout: add HTMLMediaFrameSource trait and HTMLMediaData struct
layout: add HTMLMediaFrameSource trait and HTMLMediaData struct

sadmansk/servo,notriddle/servo,paulrouget/servo,szeged/servo,saneyuki/servo,notriddle/servo,pyfisch/servo,nnethercote/servo,jimberlage/servo,larsbergstrom/servo,pyfisch/servo,emilio/servo,saneyuki/servo,splav/servo,emilio/servo,pyfisch/servo,peterjoel/servo,DominoTree/servo,larsbergstrom/servo,sadmansk/servo,peterjoel/servo,paulrouget/servo,KiChjang/servo,jimberlage/servo,saneyuki/servo,jimberlage/servo,peterjoel/servo,DominoTree/servo,DominoTree/servo,sadmansk/servo,notriddle/servo,larsbergstrom/servo,szeged/servo,saneyuki/servo,nnethercote/servo,peterjoel/servo,szeged/servo,DominoTree/servo,paulrouget/servo,peterjoel/servo,szeged/servo,nnethercote/servo,pyfisch/servo,nnethercote/servo,emilio/servo,szeged/servo,KiChjang/servo,nnethercote/servo,paulrouget/servo,jimberlage/servo,DominoTree/servo,DominoTree/servo,szeged/servo,KiChjang/servo,emilio/servo,peterjoel/servo,splav/servo,KiChjang/servo,szeged/servo,larsbergstrom/servo,paulrouget/servo,splav/servo,paulrouget/servo,pyfisch/servo,emilio/servo,saneyuki/servo,KiChjang/servo,KiChjang/servo,emilio/servo,nnethercote/servo,szeged/servo,saneyuki/servo,jimberlage/servo,larsbergstrom/servo,sadmansk/servo,szeged/servo,peterjoel/servo,emilio/servo,pyfisch/servo,saneyuki/servo,KiChjang/servo,saneyuki/servo,larsbergstrom/servo,pyfisch/servo,notriddle/servo,KiChjang/servo,splav/servo,notriddle/servo,emilio/servo,nnethercote/servo,saneyuki/servo,splav/servo,saneyuki/servo,KiChjang/servo,notriddle/servo,splav/servo,splav/servo,jimberlage/servo,KiChjang/servo,jimberlage/servo,pyfisch/servo,notriddle/servo,pyfisch/servo,splav/servo,DominoTree/servo,nnethercote/servo,paulrouget/servo,szeged/servo,pyfisch/servo,splav/servo,emilio/servo,emilio/servo,sadmansk/servo,larsbergstrom/servo,paulrouget/servo,paulrouget/servo,paulrouget/servo,splav/servo,nnethercote/servo,sadmansk/servo,jimberlage/servo,jimberlage/servo,sadmansk/servo,larsbergstrom/servo,notriddle/servo,peterjoel/servo,peterjoel/servo,notriddle/servo,nnethercote/servo,peterjoel/servo,DominoTree/servo,larsbergstrom/servo,sadmansk/servo,notriddle/servo,DominoTree/servo,DominoTree/servo,larsbergstrom/servo