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This patch adds a basic source map support to test runner. SourceMap support is powered by Chromium DevTools source map implementation (thus copyright). Unlike popular `source-map` npm module, it's sync and pretty straight-forward. The `SourceMap.js` file has a few modifications wrt upstream Chromium version: - reverse mappings API is removed. There's no need to ever compute them - the `upperBoundary` function from DevTools' platform is inlined