[web] Fix 3d transforms for html backend (flutter#21499)

* Workaround for canvas element lacking support for 3d setTransform

* update golden test

* Add webkit workaround

* Implement DOM rendering for perspective

* cleanup

* update goldens lock

* Add check for shader and filtermask for dom use

* Fix svg viewBox. Move zIndex check to bitmap canvas

* Fix null check warning

* Fix scene_builder zIndex=-1 test to force canvas usage

* Add blendmode handling for DOM mode

* Update maxdiff and golden locks

* Remove unused import

* Add drawcolor/drawpaint test. Fix bounds for drawColor/drawPaint

* update golden locks

* adjust drawColor for dpr

* Update test to use canvas

* Fix toDataUrl NNBD

* Update Picture.toImage to use canvas to obstain image data

* Remove write:true from golden calls

* Add fill-rule for _pathToSvgElement

* Update golden locks

* Fix sceneBuilder pushClip / add missing clipBehaviour

* Fix test now that clipping works correctly

* move overflow handling for tests into DOMClip.addOverflow

* Add clipRect to test to keep render inside bitmap canvas area

* Update compositing test, fix drawColor coordinates

* update golden locks

* Skip test for matchGolden infra fail

* update golden lock

* merge

* update maxdiff for text over canvas

* update golden diff

* update paint spread bounds maxdiff

* update paint spread maxDiff

Author: ferhatb

lib/web_ui/dev/goldens_lock.yaml

@@ -1,2 +1,2 @@
 repository: https://github.com/flutter/goldens.git
-revision: 1556280d6f1d70fac9ddff9b38639757e105b4b0
+revision: 67f22ef933be27ba2be8b27df1b71b2c69eb86e5