Force compositing inputs to be clean for getBoundingClientRect

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

Index: third_party/WebKit/Source/core/paint/PaintLayerScrollableAreaTest.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintLayerScrollableAreaTest.cpp b/third_party/WebKit/Source/core/paint/PaintLayerScrollableAreaTest.cpp
index d0cb1b8e53f0a5ddc75b17cd19446bc846e7de66..c633a7f2d337723e829fa19201af03fdede1adfa 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayerScrollableAreaTest.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintLayerScrollableAreaTest.cpp
@@ -28,7 +28,7 @@ class MockChromeClient : public EmptyChromeClient {
   }
 };
 
-}  // namespace {
+}  // namespace
 
 class PaintLayerScrollableAreaTest : public RenderingTest {
  public:
@@ -548,4 +548,31 @@ TEST_F(PaintLayerScrollableAreaTest, HideTooltipWhenScrollPositionChanges) {
       .Times(0);
   scrollableArea->setScrollOffset(ScrollOffset(2, 2), ProgrammaticScroll);
 }
+
+TEST_F(PaintLayerScrollableAreaTest,
+       StickyPositionConstraintsInvalidatedByLayout) {
+  setBodyInnerHTML(
+      "<style>#scroller { overflow-y: scroll; height: 100px; }"
+      "#sticky { height: 25px; position: sticky; top: 0; }"
+      "#padding { height: 500px; }</style>"
+      "<div id='scroller'><div id='sticky'></div><div id='padding'></div>"
+      "</div>");
+
+  LayoutBoxModelObject* scroller =
+      toLayoutBoxModelObject(getLayoutObjectByElementId("scroller"));
+  LayoutBoxModelObject* sticky =
+      toLayoutBoxModelObject(getLayoutObjectByElementId("sticky"));
+
+  EXPECT_FALSE(sticky->layer()->needsCompositingInputsUpdate());
+
+  PaintLayerScrollableArea* scrollableArea = scroller->getScrollableArea();
+  ASSERT_TRUE(scrollableArea);
+
+  // Fake layout.
+  scrollableArea->updateAfterLayout();
+
+  EXPECT_TRUE(sticky->layer()->needsCompositingInputsUpdate());
+  EXPECT_EQ(0u, scrollableArea->stickyConstraintsMap().size());
 }
+
+}  // namespace blink