Add a description to the pictureSourceSrc issue
Add a description to the pictureSourceSrc issue

Change-Id: I8579eebb43fe227ae45e7711aacadd4d38f5d278
Bug: 1318868
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3605492
Reviewed-by: Mathias Bynens <17a2cbc4e33156874a9862b0f530521117e66a3d@chromium.org>
Commit-Queue: Yoav Weiss <8a69898af8b343554ec414e415aab3eabca34f30@chromium.org>

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