[SPInvalidation] Force subtree paint property update on css position change

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

Index: third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilderTest.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilderTest.cpp b/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilderTest.cpp
index 969f3fae941b8ad778fbd4e7a8259c33cd639288..10952bab3ae53cfdca33cc675723a82626873dbc 100644
--- a/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilderTest.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilderTest.cpp
@@ -3156,4 +3156,31 @@ TEST_P(PaintPropertyTreeBuilderTest, TransformOriginWithAndWithoutMotionPath) {
             willChange->paintProperties()->transform()->origin());
 }
 
+TEST_P(PaintPropertyTreeBuilderTest, ChangePositionUpdateDescendantProperties) {
+  setBodyInnerHTML(
+      "<style>"
+      "  * { margin: 0; }"
+      "  #ancestor { position: absolute; overflow: hidden }"
+      "  #descendant { position: absolute }"
+      "</style>"
+      "<div id='ancestor'>"
+      "  <div id='descendant'></div>"
+      "</div>");
+
+  LayoutObject* ancestor = getLayoutObjectByElementId("ancestor");
+  LayoutObject* descendant = getLayoutObjectByElementId("descendant");
+  EXPECT_EQ(ancestor->paintProperties()->overflowClip(),
+            descendant->paintProperties()
+                ->localBorderBoxProperties()
+                ->propertyTreeState.clip());
+
+  toElement(ancestor->node())
+      ->setAttribute(HTMLNames::styleAttr, "position: static");
+  document().view()->updateAllLifecyclePhases();
+  EXPECT_NE(ancestor->paintProperties()->overflowClip(),
+            descendant->paintProperties()
+                ->localBorderBoxProperties()
+                ->propertyTreeState.clip());
+}
+
 }  // namespace blink