Auto merge of #13610 - glennw:sim-mouse-wr, r=mbrubeck
Auto merge of #13610 - glennw:sim-mouse-wr, r=mbrubeck

Allow simulate_mouse_click to work with webrender.

Instead of dispatching to a specific layer, call the dispatch
functions for mouse (move) events that handle whether webrender
is enabled or not.

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/13610)
<!-- Reviewable:end -->

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