收集 Ninja 轨迹信息，以便在 chrome://tracing 中进行分析
Usage: fx ninjatrace2json
Use this after a build to write "ninjatrace.json" in the build directory.
See //build/scripts/ninjatrace2json.py for more usage information.
fx ninjatrace2json
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最后更新时间 (UTC)：2025-07-24。
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