Bug 1370034 - Add -moz-window-opacity property, style system parts (excluding stylo). r=dbaron

MozReview-Commit-ID: J2SPMzh0I9C

layout/base/RestyleManager.cpp

@@ -459,6 +459,7 @@ RestyleManager::ChangeHintToString(nsChangeHint aHint)
     "ReflowChangesSizeOrPosition", "UpdateComputedBSize",
     "UpdateUsesOpacity", "UpdateBackgroundPosition",
     "AddOrRemoveTransform", "CSSOverflowChange",
+    "UpdateWidgetProperties"
   };
   static_assert(nsChangeHint_AllHints == (1 << ArrayLength(names)) - 1,
                 "Name list doesn't match change hints.");
@@ -1713,6 +1714,9 @@ RestyleManager::ProcessRestyledFrames(nsStyleChangeList& aChangeList)
         presContext->PresShell()->SynthesizeMouseMove(false);
         didUpdateCursor = true;
       }
+      if (hint & nsChangeHint_UpdateWidgetProperties) {
+        frame->UpdateWidgetProperties();
+      }
     }
   }