Bug 1386964 - Set default tab height, mark flaky viewport-units-css2-001.html subtests as passing on Linux as well as anchoring-with-bounds-clamping.html on Mac. r=dholbert

MozReview-Commit-ID: 2gNQSImPfw1

--HG--
extra : rebase_source : d9c78ddbc9196f5f9975e78cc7715b0adb8b4b1a

browser/themes/shared/tabs.inc.css

@@ -6,12 +6,10 @@
 
 :root {
   --tab-toolbar-navbar-overlap: 1px;
-/* Temporarily using the compact tab strip by default because of bug 1386964:
   --tab-min-height: 33px;
 }
 
 :root[uidensity=compact] {
-*/
   --tab-min-height: 29px;
 }
 

testing/web-platform/meta/css/css-values-3/viewport-units-css2-001.html.ini

@@ -7,10 +7,12 @@
       if not debug and e10s and (os == "win") and (version == "6.2.9200") and (processor == "x86_64") and (bits == 64): FAIL
 
   [vh length applied to border-top-width]
-    expected: FAIL
+    expected:
+      if os != "linux": FAIL
 
   [vmin length applied to border-top-width]
-    expected: FAIL
+    expected:
+      if os != "linux": FAIL
 
   [vmax length applied to border-top-width]
     expected:

testing/web-platform/meta/scroll-anchoring/anchoring-with-bounds-clamping.html.ini

@@ -1,5 +1,6 @@
 [anchoring-with-bounds-clamping.html]
   type: testharness
   [Anchoring combined with scroll bounds clamping in the document.]
-    expected: FAIL
+    expected:
+      if os != "mac": FAIL