Commits on Sep 25, 2018

1. [scheduler] Priority levels, continuations, and wrapped callbacks …

   All of these features are based on features of React's internal
   scheduler. The eventual goal is to lift as much as possible out of the
   React internals into the Scheduler package.
   
   Includes some renaming of existing methods.
   
   - `scheduleWork` is now `scheduleCallback`
   - `cancelScheduledWork` is now `cancelCallback`
   
   
   Priority levels
   ---------------
   
   Adds the ability to schedule callbacks at different priority levels.
   The current levels are (final names TBD):
   
   - Immediate priority. Fires at the end of the outermost currently
   executing (similar to a microtask).
   - Interactive priority. Fires within a few hundred milliseconds. This
   should only be used to provide quick feedback to the user as a result
   of an interaction.
   - Normal priority. This is the default. Fires within several seconds.
   - "Maybe" priority. Only fires if there's nothing else to do. Used for
   prerendering or warming a cache.
   
   The priority is changed using `runWithPriority`:
   
   ```js
   runWithPriority(InteractivePriority, () => {
     scheduleCallback(callback);
   });
   ```
   
   
   Continuations
   -------------
   
   Adds the ability for a callback to yield without losing its place
   in the queue, by returning a continuation. The continuation will have
   the same expiration as the callback that yielded.
   
   
   Wrapped callbacks
   -----------------
   
   Adds the ability to wrap a callback so that, when it is called, it
   receives the priority of the current execution context.

   

   acdlite committed Sep 25, 2018
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