[web] we need to warm-up CanvasKit renderer shaders #75801
Description
Currently shader warm-up is conditional behind kIsWeb flag because the HTML renderer crashes during warm-up. Because the flag doesn't distinguish between HTML and CanvasKit we end up not warming up CanvasKit either. This leads to jank in the middle of animations after the app starts up. We need a way to do the shader warm-up for the CanvasKit renderer.
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High-priority issues at the top of the work listRelates to speed or footprint issues (see "perf:" labels)CanvasKit (a.k.a. Skia-on-WebGL) rendering backend for Webflutter/engine related. See also e: labels.flutter/packages/flutter repository. See also f: labels.Relatively approachable for first-time contributorsWeb applications specifically