isEngine(query) {
    return compare(
      UserAgentData.engineName,
      UserAgentData.engineVersion,
      query
    );
  }
Check if the User Agent rendering engine matches `query`.

`query` should be a string like "WebKit" or "WebKit >= 537".

Valid engine names include:

- Gecko
- Presto
- Trident
- WebKit
- etc...

An authoritative list can be found in the PHP `RenderingEngineDetector`
class related classes in the same file (see calls to `new
UserAgentRenderingEngine` here: https://fburl.com/50728617).

@note Function results are memoized

@param {string} query Query of the form "Name [range expression]"
@return {boolean}