Observe, inspect and perhaps modify a React tree through the React DevTools Hook
這裡只顯示彼此間有代碼差異的版本。 顯示所有版本。
added a `ReactTools.withReduxState()` static method. make ReactTools a singleton.
Pass the updated fiber root to the observers.I was going to say it's a bit more correct that way, but then I glanced at the source, and I saw the "goto end" line. yeah..
