Bug 1022612. Part 1: Always pass a frame to AutoBuildingDisplayList. r=mattwoodrow

--HG--
extra : rebase_source : c76f7af7e65a4e98dc3ee0a8309d0c05e02cf82e

layout/base/nsDisplayList.h

@@ -533,17 +533,6 @@ public:
   friend class AutoBuildingDisplayList;
   class AutoBuildingDisplayList {
   public:
-    AutoBuildingDisplayList(nsDisplayListBuilder* aBuilder, bool aIsRoot)
-      : mBuilder(aBuilder),
-        mPrevCachedOffsetFrame(aBuilder->mCachedOffsetFrame),
-        mPrevCachedReferenceFrame(aBuilder->mCachedReferenceFrame),
-        mPrevLayerEventRegions(aBuilder->mLayerEventRegions),
-        mPrevCachedOffset(aBuilder->mCachedOffset),
-        mPrevIsAtRootOfPseudoStackingContext(aBuilder->mIsAtRootOfPseudoStackingContext),
-        mPrevAncestorHasTouchEventHandler(aBuilder->mAncestorHasTouchEventHandler)
-    {
-      aBuilder->mIsAtRootOfPseudoStackingContext = aIsRoot;
-    }
     AutoBuildingDisplayList(nsDisplayListBuilder* aBuilder,
                             nsIFrame* aForChild, bool aIsRoot)
       : mBuilder(aBuilder),

layout/generic/nsFrame.cpp

@@ -1953,7 +1953,7 @@ nsIFrame::BuildDisplayListForStackingContext(nsDisplayListBuilder* aBuilder,
 
   nsDisplayListCollection set;
   {    
-    nsDisplayListBuilder::AutoBuildingDisplayList rootSetter(aBuilder, true);
+    nsDisplayListBuilder::AutoBuildingDisplayList rootSetter(aBuilder, this, true);
     DisplayListClipState::AutoSaveRestore nestedClipState(aBuilder);
     nsDisplayListBuilder::AutoInTransformSetter
       inTransformSetter(aBuilder, inTransform);