Chrome Version       : 70.0.3534.4
OS Version: Chrome

Currently the gallery only uses the ImageLoader extension and image_loader_client.js for loading RAW images.

This means there is duplicate logic for loading images, and also that Gallery misses out on persistent caching. That makes loading thumbnails in Gallery really slow.

Using ImageLoader will not only give it persistent caching, but also allow it to share thumbnails with Files app, which would be great.

First, we need to clean up the ImageLoader API - Issue 879958