Responsive Demos breakpoints not working consistently

[ThomasBurleson]

Flex-Layout publishes responsive demos.
For example:

Bug Report

Breakpoint changes:

• for shrinking view sizes (large to smaller) seem to work.
• for increasing view sizes (small to larger) seem to be broken.

In particular the gt-xs and gt-sm seem to be not working.

[ThomasBurleson]

Attn: @CaerusKaru

[CaerusKaru]

Duplicate of #1059

[CaerusKaru]

Tracking fix here, but not prioritized by Blink/Chromium team: https://bugs.chromium.org/p/chromium/issues/detail?id=1285532