Bug 911889. Part 7: A single change to CSS 'transform' should not be treated as animation. r=dbaron

--HG--
extra : rebase_source : 241ce14bd7b3986141c557da566a3756658befa5

layout/base/ActiveLayerTracker.cpp

@@ -162,11 +162,7 @@ ActiveLayerTracker::IsStyleAnimated(nsIFrame* aFrame, nsCSSProperty aProperty)
 {
   LayerActivity* layerActivity = GetLayerActivity(aFrame);
   if (layerActivity) {
-    // XXX should we really treat a single change to transform as animation?
-    uint8_t minStyleChangesToBeConsideredAnimation =
-        aProperty == eCSSProperty_opacity ? 2 : 1;
-    if (layerActivity->RestyleCountForProperty(aProperty) >=
-        minStyleChangesToBeConsideredAnimation) {
+    if (layerActivity->RestyleCountForProperty(aProperty) >= 2) {
       return true;
     }
   }