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

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/paint/PaintPropertyTreeBuilderTest.h"
 
 #include "core/html/HTMLIFrameElement.h"
 #include "core/layout/LayoutTreeAsText.h"
 #include "core/paint/ObjectPaintProperties.h"
 #include "core/paint/PaintPropertyTreePrinter.h"
@@ skipping 3138 matching lines @@
   EXPECT_EQ(FloatPoint3D(50, 50, 0),
             motionPath->paintProperties()->transform()->origin());
 
   auto* willChange = document().getElementById("willChange")->layoutObject();
   EXPECT_EQ(TransformationMatrix().translate3d(0, 0, 0),
             willChange->paintProperties()->transform()->matrix());
   EXPECT_EQ(FloatPoint3D(0, 0, 0),
             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