public synchronized void onReusabilityChange(CacheKey key, boolean isReusable) {
    if (isReusable) {
      mFreeItemsPool.add(key);
    } else {
      mFreeItemsPool.remove(key);
    }
  }
Facade to the image memory cache for frames of an animated image.

<p>Each animated image should have its own instance of this class.
animated-base/src/main/java/com/facebook/imagepipeline/animated/impl/AnimatedFrameCache.java