Bug 1368610 - Part 6: Add tests for valid inherit value during animation. r=hiro

This tests are to confirm either we could get valid value of 'inherit' of
keyframe.
Also, this tests are for clone_XX methods of stylo as well.

MozReview-Commit-ID: J6HZBRZB5am

--HG--
extra : rebase_source : c8c282f3204d94931112fa9811bb5c51b8fe6992

dom/animation/test/mozilla/test_moz-prefixed-properties.html

@@ -19,6 +19,9 @@ const testcases = [
   {
     property: "-moz-box-direction"
   },
+  {
+    property: "-moz-box-ordinal-group"
+  },
   {
     property: "-moz-box-orient",
     expectedValueMap: {
@@ -39,6 +42,12 @@ const testcases = [
     property: "-moz-osx-font-smoothing",
     pref: "layout.css.osx-font-smoothing.enabled"
   },
+  {
+    property: "-moz-stack-sizing"
+  },
+  {
+    property: "-moz-text-size-adjust"
+  },
   {
     property: "-moz-user-focus"
   },
@@ -51,6 +60,9 @@ const testcases = [
   {
     property: "-moz-window-dragging"
   },
+  {
+    property: "-moz-force-broken-image-icon"
+  },
 ];
 
 testcases.forEach(testcase => {