Bug 1131840 - Propagate the EventRegionsOverride flag on RefLayers also. r=roc

gfx/layers/Layers.cpp

@@ -1274,7 +1274,7 @@ ContainerLayer::DidInsertChild(Layer* aLayer)
 void
 RefLayer::FillSpecificAttributes(SpecificLayerAttributes& aAttrs)
 {
-  aAttrs = RefLayerAttributes(GetReferentId());
+  aAttrs = RefLayerAttributes(GetReferentId(), mEventRegionsOverride);
 }
 
 /** 

gfx/layers/ipc/LayerTransactionParent.cpp

@@ -428,6 +428,7 @@ LayerTransactionParent::RecvUpdate(InfallibleTArray<Edit>&& cset,
           return false;
         }
         refLayer->SetReferentId(specific.get_RefLayerAttributes().id());
+        refLayer->SetEventRegionsOverride(specific.get_RefLayerAttributes().eventRegionsOverride());
         break;
       }
       case Specific::TImageLayerAttributes: {

gfx/layers/ipc/LayersMessages.ipdlh

@@ -243,7 +243,12 @@ struct ContainerLayerAttributes {
 };
 struct ColorLayerAttributes     { LayerColor color; nsIntRect bounds; };
 struct CanvasLayerAttributes    { GraphicsFilterType filter; nsIntRect bounds; };
-struct RefLayerAttributes       { int64_t id; };
+struct RefLayerAttributes {
+  int64_t id;
+  // TODO: Once bug 1132895 is fixed we shouldn't need to propagate the override
+  // explicitly here.
+  EventRegionsOverride eventRegionsOverride;
+};
 struct ImageLayerAttributes     { GraphicsFilterType filter; IntSize scaleToSize; ScaleMode scaleMode; };
 
 union SpecificLayerAttributes {