Bug 907503 - Fix invalidation for SMIL animation in SVG-as-an-image. r=roc

layout/base/nsDisplayList.cpp

@@ -1141,7 +1141,16 @@ void nsDisplayList::PaintForFrame(nsDisplayListBuilder* aBuilder,
     BuildContainerLayerFor(aBuilder, layerManager, aForFrame, nullptr, *this,
                            containerParameters, nullptr);
 
-  if (widgetTransaction) {
+  nsIDocument* document = nullptr;
+  if (presShell) {
+    document = presShell->GetDocument();
+  }
+
+  if (widgetTransaction ||
+      // SVG-as-an-image docs don't paint as part of the retained layer tree,
+      // but they still need the invalidation state bits cleared in order for
+      // invalidation for CSS/SMIL animation to work properly.
+      (document && document->IsBeingUsedAsImage())) {
     aForFrame->ClearInvalidationStateBits();
   }
 
@@ -1177,13 +1186,10 @@ void nsDisplayList::PaintForFrame(nsDisplayListBuilder* aBuilder,
   }
 
   bool mayHaveTouchListeners = false;
-  if (presShell) {
-    nsIDocument* document = presShell->GetDocument();
-    if (document) {
-      nsCOMPtr<nsPIDOMWindow> innerWin(document->GetInnerWindow());
-      if (innerWin) {
-        mayHaveTouchListeners = innerWin->HasTouchEventListeners();
-      }
+  if (document) {
+    nsCOMPtr<nsPIDOMWindow> innerWin(document->GetInnerWindow());
+    if (innerWin) {
+      mayHaveTouchListeners = innerWin->HasTouchEventListeners();
     }
   }