Hard to spot but behind the orange from bug 1378163 there is some 'inverse' orange - files that we don't package but that are referenced from non-ifdef'd CSS. Specifically: [task 2017-07-04T15:06:21.466571Z] 15:06:21 INFO - Buffered messages finished [task 2017-07-04T15:06:21.468745Z] 15:06:21 INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/static/browser_parsable_css.js | missing chrome://browser/skin/customizableui/density-normal.svg referenced from chrome://browser/skin/browser.css - [task 2017-07-04T15:06:21.470486Z] 15:06:21 INFO - Stack trace: [task 2017-07-04T15:06:21.472343Z] 15:06:21 INFO - chrome://mochitests/content/browser/browser/base/content/test/static/browser_parsable_css.js:checkAllTheCSS:340 [task 2017-07-04T15:06:21.477831Z] 15:06:21 INFO - Not taking screenshot here: see the one that was previously logged [task 2017-07-04T15:06:21.483871Z] 15:06:21 INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/static/browser_parsable_css.js | missing chrome://browser/skin/customizableui/density-compact.svg referenced from chrome://browser/skin/browser.css - [task 2017-07-04T15:06:21.485777Z] 15:06:21 INFO - Stack trace: [task 2017-07-04T15:06:21.487722Z] 15:06:21 INFO - chrome://mochitests/content/browser/browser/base/content/test/static/browser_parsable_css.js:checkAllTheCSS:340 [task 2017-07-04T15:06:21.496211Z] 15:06:21 INFO - Not taking screenshot here: see the one that was previously logged [task 2017-07-04T15:06:21.499797Z] 15:06:21 INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/static/browser_parsable_css.js | missing chrome://browser/skin/customizableui/density-touch.svg referenced from chrome://browser/skin/browser.css -

Johann, could you help with this? :-)

Hah, I was wondering if not putting that CSS behind MOZ_PHOTON_THEME would cause something to explode. Sorry for that. I'll fix it of course.

Above was non-Photon, this one is with Photon enabled: https://treeherder.mozilla.org/#/jobs?repo=try&revision=bc7f8d2c11784dc06bc21e5e37edb15802f2448e

Comment on attachment 8884269 [details] Bug 1378215 - Put references to Photon-only images behind Photon compile flags. https://reviewboard.mozilla.org/r/155216/#review160246

I think the non-Photon try has failures because I didn't disable structure. I'll go ahead and land this.

Pushed by jhofmann@mozilla.com: https://hg.mozilla.org/integration/autoland/rev/fa7711419df0 Put references to Photon-only images behind Photon compile flags. r=Gijs