Bug 1321412 - Feed the return value of ShouldPrerenderTransformedContent() directly into nsDisplayTransform::mAllowAsyncAnimation. r=mattwoodrow

MozReview-Commit-ID: L00D3h5PhTF

--HG--
extra : rebase_source : 9d834c4cd75ce120e743c49732a538decc05c1cf

layout/generic/nsFrame.cpp

@@ -2205,11 +2205,13 @@ nsIFrame::BuildDisplayListForStackingContext(nsDisplayListBuilder* aBuilder,
   aBuilder->SetContainsBlendMode(false);
  
   nsRect dirtyRectOutsideTransform = dirtyRect;
+  bool allowAsyncAnimation = false;
   if (isTransformed) {
     const nsRect overflow = GetVisualOverflowRectRelativeToSelf();
     if (nsDisplayTransform::ShouldPrerenderTransformedContent(aBuilder,
                                                               this)) {
       dirtyRect = overflow;
+      allowAsyncAnimation = true;
     } else {
       if (overflow.IsEmpty() && !extend3DContext) {
         return;
@@ -2571,12 +2573,10 @@ nsIFrame::BuildDisplayListForStackingContext(nsDisplayListBuilder* aBuilder,
 
     if (!aBuilder->IsForGenerateGlyphMask() &&
         !aBuilder->IsForPaintingSelectionBG()) {
-      bool isFullyVisible =
-        dirtyRectOutsideSVGEffects.Contains(GetVisualOverflowRectRelativeToSelf());
       nsDisplayTransform *transformItem =
         new (aBuilder) nsDisplayTransform(aBuilder, this,
                                           &resultList, dirtyRect, 0,
-                                          isFullyVisible);
+                                          allowAsyncAnimation);
       resultList.AppendNewToTop(transformItem);
     }