GitLab

flattenhtml does not work with Polymer3 generated files. Instead register
images with the WebUIDataSource so that they can be served by a
chrome://extensions URL.

Bug: None
Change-Id: I33346fac61b1f4d0937615fa8dde38c22809de89
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2003196Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732542}