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d205cf6af6
At some point, we started setting `useColorEmoji` to true in our tests, but we were doing it in a way that resets all other configurations to their defaults. This caused the `canvasKitVariant` config to be lost and always set to the default `auto`. This PR fixes the issue and adds tests to: 1. Make sure that the CanvasKit suite always runs with a specific variant (not `auto`). 2. Make sure the given CanvasKit variant makes it all the way through to the tests. The test harness uses a backdoor (a global JS property on `window`) to communicate which canvaskit variant it's using. The test then compares that with `configuration.canvasKitVariant` to make sure they match. If they don't match, then the configuration was lost somewhere on the way. Fixes https://github.com/flutter/flutter/issues/130993