mozilla-release: changeset 341309:9ac50a46557b81ae92a7e16742215afb270ee599

☠☠ backed out by bd393975aadd ☠ ☠
author	Matt Woodrow <mwoodrow@mozilla.com>
	Fri, 03 Jun 2016 14:24:38 +1200
changeset 341309	9ac50a46557b81ae92a7e16742215afb270ee599
parent 341308	9cda37e5a58175e5d8f101b7fd07a3db6fa00138
child 341310	15b5f8019521010072d3efa96ef4105a77443d9d
push id	1183
push user	raliiev@mozilla.com
push date	Mon, 05 Sep 2016 20:01:49 +0000
treeherder	mozilla-release@3148731bed45 [default view] [failures only]
perfherder	[talos] [build metrics] [platform microbench] (compared to previous push)
reviewers	mstange
bugs	1274962
milestone	49.0a1
first release with	nightly linux32 e27fe24a746f / 49.0a1 / 20160603030242 / files nightly linux64 e27fe24a746f / 49.0a1 / 20160603030242 / files nightly mac e27fe24a746f / 49.0a1 / 20160603030242 / files nightly win32 e27fe24a746f / 49.0a1 / 20160603030242 / files nightly win64 e27fe24a746f / 49.0a1 / 20160603030242 / files
last release without	nightly linux32 34a8be4346a9 / 49.0a1 / 20160602030220 / files nightly linux64 34a8be4346a9 / 49.0a1 / 20160602030220 / files nightly mac 34a8be4346a9 / 49.0a1 / 20160602030220 / files nightly win32 34a8be4346a9 / 49.0a1 / 20160602030220 / files nightly win64 34a8be4346a9 / 49.0a1 / 20160602030220 / files

--- a/layout/base/nsDisplayList.h
+++ b/layout/base/nsDisplayList.h
@@ -3385,16 +3385,21 @@ public:
   virtual void WriteDebugInfo(std::stringstream& aStream) override;
 
   bool CanUseAsyncAnimations(nsDisplayListBuilder* aBuilder) override;
 
   void SetParticipatesInPreserve3D(bool aParticipatesInPreserve3D)
   {
     mParticipatesInPreserve3D = aParticipatesInPreserve3D;
   }
+
+  virtual bool ShouldBuildLayerEvenIfInvisible(nsDisplayListBuilder* aBuilder) override
+  {
+    return mParticipatesInPreserve3D;
+  }
 private:
   float mOpacity;
   bool mForEventsOnly;
   bool mParticipatesInPreserve3D;
 };
 
 class nsDisplayBlendMode : public nsDisplayWrapList {
 public: