Bug 1555454 - move mochitests-plain over to macosx1014 r=jmaher

Changes:

- migrate over `mochitest-plain` to macosx1014
- disable some tests that are known to be problematic on macosx1014; they are noted in the comments

Differential Revision: https://phabricator.services.mozilla.com/D34589

--HG--
extra : moz-landing-system : lando

docshell/test/navigation/mochitest.ini

@@ -73,7 +73,7 @@ skip-if = (toolkit == 'android') || (!debug && (os == 'mac' || os == 'win')) # B
 [test_opener.html]
 [test_popup-navigates-children.html]
 [test_reserved.html]
-skip-if = (toolkit == 'android') || (debug && e10s) #too slow on Android 4.3 aws only; bug 1030403; bug 1263213 for debug e10s
+skip-if = (toolkit == 'android') || (debug && e10s) || (os == 'mac' && os_version == '10.14') #too slow on Android 4.3 aws only; bug 1030403; bug 1263213 for debug e10s, macosx1014 due to 1548821
 [test_sessionhistory.html]
 skip-if = toolkit == 'android' # RANDOM on android
 support-files = file_bug1379762-1.html

image/test/mochitest/mochitest.ini

@@ -100,7 +100,7 @@ skip-if = os == 'android'
 [test_animation2.html]
 skip-if = os == 'android'
 [test_animSVGImage.html]
-skip-if = os == 'android' || os == 'win' # Bug 1370784
+skip-if = os == 'android' || os == 'win' || (os == 'mac' && os_version == '10.14') # Bug 1370784, macosx due to bug 1549058
 [test_animSVGImage2.html]
 skip-if = os == 'android' || (webrender && os == 'win') || (webrender && os == 'linux') #Bug 1354561
 [test_background_image_anim.html]

taskcluster/ci/test/test-sets.yml

@@ -319,7 +319,7 @@ macosx1014-64-tests:
     - jittest
     - jsreftest
     - marionette
-    # - mochitest
+    - mochitest
     - mochitest-a11y
     # - mochitest-browser-chrome
     # - mochitest-chrome