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Remove initial jank in flutter_gallery using more shader warm-up #31881

@liyuqian

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@liyuqian

Our goal is to drop out flutter_gallery worst frame time benchmark down to 16ms on both Android and iOS. Currently it sits at about 120+ms. Part of it is because that we're measuring the wrong thing #31442 . After fixing #31442, we still have some shader warm-up work to do.

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P1High-priority issues at the top of the work listc: contributor-productivityTeam-specific productivity, code health, technical debt.c: performanceRelates to speed or footprint issues (see "perf:" labels)customer: galleryRelating to flutter/gallery repository. Please transfer non-framework issues there.engineflutter/engine related. See also e: labels.

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