* Visual testing for Cornerstone and VTK
* Fix for CI
* Review fix: Removed cornerstone function and added snapshot description
* Added snapshot description
* Fix for CI
* Try workaround for percy snapshot
* Return our modified document
* test: some dark magic to make it possible to take screenshots of WebGL canvases
* Apply transformation directly to test DOM
* investigate: window:before:load
* Register flag in correct place; add experimental-webgl check
* Remaining canvas fixes
* Remove comment
* Adding Percy Snapshot on VTK, PDF and Microscopy tests
* Small improvement to always click on first search result
* Wait for search result
* Added timouts all over the code to avoid intermitted failures in CI
* Increasing Default Timeout and other configs
* Cleaning up the code
* try force enabling gpu
* Try custom executor with newer version of chrome
* Fix based on review comments
* Increased minimum thumbnails expected on VTK test
* Fix config validation
* Make sure we're using the chrome browser
