Force compositing inputs to be clean for getBoundingClientRect

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

 // Copyright 2016 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/PaintLayerScrollableArea.h"
 
 #include "core/frame/FrameView.h"
 #include "core/layout/LayoutBoxModelObject.h"
 #include "core/layout/LayoutTestHelper.h"
 #include "core/paint/PaintLayer.h"
@@ skipping 10 matching lines @@
 class MockChromeClient : public EmptyChromeClient {
  public:
   MOCK_METHOD3(mockSetToolTip, void(LocalFrame*, const String&, TextDirection));
   void setToolTip(LocalFrame& frame,
                   const String& tooltipText,
                   TextDirection dir) override {
     mockSetToolTip(&frame, tooltipText, dir);
   }
 };
 
-}  // namespace {
+}  // namespace
 
 class PaintLayerScrollableAreaTest : public RenderingTest {
  public:
   PaintLayerScrollableAreaTest()
       : RenderingTest(EmptyFrameLoaderClient::create()),
         m_chromeClient(new MockChromeClient) {}
 
   ~PaintLayerScrollableAreaTest() {
     testing::Mock::VerifyAndClearExpectations(&chromeClient());
   }
@@ skipping 499 matching lines @@
   EXPECT_CALL(chromeClient(), mockSetToolTip(document().frame(), String(), _))
       .Times(1);
   scrollableArea->setScrollOffset(ScrollOffset(1, 1), UserScroll);
 
   // Programmatic scrolling should not dismiss the tooltip, so setToolTip
   // should not be called for this invocation.
   EXPECT_CALL(chromeClient(), mockSetToolTip(document().frame(), String(), _))
       .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