Was there another bug for gzipping CSS resources that you can point readers to for reference?

Also, is there a bigger effort to gzip more structures? Is the CSS already minified? What's the size impact?

CSS resources were historically gzipped but in crrev.com/c/657024 we moved from an <include> to a <structure> to be able to embed images. The structure tag does not support compression so we temporarily disabled it. Now we would like to re-enable it. We have seen around a 53kb regression in resource sizes by not using gzip.

Sounds like this is a one-off, but having compression support opens up the possibility of compressing other <structure> objects. Great!

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/18e58e4ab2b8837fd40481ef3527c677bf4c95ef

commit 18e58e4ab2b8837fd40481ef3527c677bf4c95ef
Author: Becca Hughes <beccahughes@chromium.org>
Date: Tue Oct 03 10:07:30 2017

Media Controls: Enable Gzip of CSS resources.

When we moved the CSS files to use "chrome_html" so we can embed
images we had to remove gzip because Grit doesn't support the
compress attribute on <structure> tags. This adds support for
the compress attribute and re-enables gzip in the media controls.

BUG= 762902 

Change-Id: I304d4c28c800f4977aaa3d975c4a456722bf601e
Reviewed-on: https://chromium-review.googlesource.com/692020
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505996}
[modify] https://crrev.com/18e58e4ab2b8837fd40481ef3527c677bf4c95ef/third_party/WebKit/Source/modules/media_controls/MediaControlsResourceLoader.cpp
[modify] https://crrev.com/18e58e4ab2b8837fd40481ef3527c677bf4c95ef/third_party/WebKit/Source/modules/media_controls/resources/media_controls_resources.grd
[modify] https://crrev.com/18e58e4ab2b8837fd40481ef3527c677bf4c95ef/tools/grit/grit/node/base.py
[modify] https://crrev.com/18e58e4ab2b8837fd40481ef3527c677bf4c95ef/tools/grit/grit/node/include.py
[modify] https://crrev.com/18e58e4ab2b8837fd40481ef3527c677bf4c95ef/tools/grit/grit/node/structure.py
[modify] https://crrev.com/18e58e4ab2b8837fd40481ef3527c677bf4c95ef/tools/grit/grit/node/structure_unittest.py