Bug 1296123 - SetPerformanceWarning should be called against eCSSProperty_opacity! r=hiro

MozReview-Commit-ID: BCcXiRUui7Z

--HG--
extra : rebase_source : 2d11ce5720fd95a7c4f20ebb8b32f520bd49586a

layout/base/nsDisplayList.cpp

@@ -5882,7 +5882,7 @@ nsDisplayOpacity::CanUseAsyncAnimations(nsDisplayListBuilder* aBuilder)
   }
 
   EffectCompositor::SetPerformanceWarning(
-    mFrame, eCSSProperty_transform,
+    mFrame, eCSSProperty_opacity,
     AnimationPerformanceWarning(
       AnimationPerformanceWarning::Type::OpacityFrameInactive));