fix(force invert): hide Container type treatment behind feature flag

Bug: 364172907
Change-Id: If92a59ae84e395f64267980baeba5d7ceaef7e39
Test: nope
Flag: EXEMPT bugfix
diff --git a/libs/hwui/RenderNode.h b/libs/hwui/RenderNode.h
index c904542..afbbce7 100644
--- a/libs/hwui/RenderNode.h
+++ b/libs/hwui/RenderNode.h
@@ -234,6 +234,7 @@
     void syncDisplayList(TreeObserver& observer, TreeInfo* info);
     void handleForceDark(TreeInfo* info);
     bool shouldEnableForceDark(TreeInfo* info);
+    bool isForceInvertDark(TreeInfo& info);
 
     void prepareTreeImpl(TreeObserver& observer, TreeInfo& info, bool functorsNeedLayer);
     void pushStagingPropertiesChanges(TreeInfo& info);