Tests render blocking status in script traces.
Recording started
Tracing complete
empty.js?dynamic: non_blocking
empty.js?dynamicAsync: non_blocking
empty.js?dynamicAsyncModule: non_blocking
empty.js?dynamicAsyncModuleBlocking: blocking
empty.js?dynamicBlocking: blocking
empty.js?dynamicDefer: non_blocking
empty.js?dynamicModuleBlocking: blocking
empty.js?dynamicNonAsync: non_blocking