Currently the WebGL shaders (*.vert and *.frag files) are not minified when they are bundled into the minified bundles such as bokeh-gl.min.js. They should be minified to reduce bundle and download size.

Things to do:

1. Remove comments
2. Remove unnecessary whitespace
3. Rename temporary variables to have shorter names (optional)

Items 1 and 2 could be done by someone without any GLSL knowledge. Item 3 needs some knowledge of what are and aren't GLSL keywords which is why I have labelled it optional.

This could be done using a third-party JavaScript library, or we could roll our own alongside similar code in the bokehjs/make/tasks directory.