Re: [screen-wake-lock] Need maximum screen brightness mode (#129)

That makes me think: Would you add another method to `WakeLockSentinel` to update the brightness while keeping the screen wake lock or would you have to release and obtain a new one to change the brightness?

Moreover, if we decide to add a second parameter to `request()` as below, how would proceed with feature detection for screen brightness? Looking for a potential `updateBrightness()` method in `WakeLockSentinel.prototype` or something else?

```diff
-  Promise<WakeLockSentinel> request(optional WakeLockType type = "screen");
+  Promise<WakeLockSentinel> request(optional WakeLockType type = "screen", WakeLockOptions options);

+  dictionary WakeLockOptions {
+    // The screen brightness ranging from 0.0 to 100.0.
+    double brightness;
+  };
```

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