Force subtree paint property updates on local border box changes

third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.cpp

Index: third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.cpp b/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.cpp
index daad53c7bd927931e14cb6edae7f2f62659eb14a..72018f4119419998cde1405e411bd199a7dc2f22 100644
--- a/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.cpp
@@ -526,10 +526,10 @@ void PaintPropertyTreeBuilder::updateLocalBorderBoxContext(
   // we don't need them at the moment.
   if (!object.isBox() && !object.hasLayer()) {
     if (auto* properties = object.getMutableForPainting().paintProperties())
-      properties->clearLocalBorderBoxProperties();
+      context.forceSubtreeUpdate |= properties->clearLocalBorderBoxProperties();
   } else {
     auto& properties = object.getMutableForPainting().ensurePaintProperties();
-    properties.updateLocalBorderBoxProperties(
+    context.forceSubtreeUpdate |= properties.updateLocalBorderBoxProperties(
         context.current.paintOffset, context.current.transform,
         context.current.clip, context.currentEffect, context.current.scroll);
   }