Handle nested position:sticky elements correctly (compositor)

third_party/WebKit/Source/web/tests/ScrollingCoordinatorTest.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 355 matching lines @@
         layer->stickyPositionConstraint();
     ASSERT_TRUE(constraint.isSticky);
     EXPECT_TRUE(constraint.isAnchoredTop && constraint.isAnchoredLeft &&
                 !constraint.isAnchoredRight && !constraint.isAnchoredBottom);
     EXPECT_EQ(1.f, constraint.topOffset);
     EXPECT_EQ(1.f, constraint.leftOffset);
     EXPECT_EQ(IntRect(100, 100, 10, 10),
               IntRect(constraint.scrollContainerRelativeStickyBoxRect));
     EXPECT_EQ(IntRect(100, 100, 200, 200),
               IntRect(constraint.scrollContainerRelativeContainingBlockRect));
-    EXPECT_EQ(IntPoint(100, 100),
-              IntPoint(constraint.parentRelativeStickyBoxOffset));
+    EXPECT_EQ(FloatPoint(100, 100),
+              FloatPoint(constraint.parentRelativeStickyBoxOffset));
   }
   {
     Element* element = document->getElementById("div-tr");
     ASSERT_TRUE(element);
     WebLayer* layer = webLayerFromElement(element);
     ASSERT_TRUE(layer);
     WebLayerStickyPositionConstraint constraint =
         layer->stickyPositionConstraint();
     ASSERT_TRUE(constraint.isSticky);
     EXPECT_TRUE(constraint.isAnchoredTop && !constraint.isAnchoredLeft &&
@@ skipping 53 matching lines @@
     WebLayer* layer = webLayerFromElement(element);
     ASSERT_TRUE(layer);
     WebLayerStickyPositionConstraint constraint =
         layer->stickyPositionConstraint();
     ASSERT_TRUE(constraint.isSticky);
     EXPECT_TRUE(constraint.isAnchoredTop);
     EXPECT_EQ(IntRect(100, 110, 10, 10),
               IntRect(constraint.scrollContainerRelativeStickyBoxRect));
     EXPECT_EQ(IntRect(100, 100, 200, 200),
               IntRect(constraint.scrollContainerRelativeContainingBlockRect));
-    EXPECT_EQ(IntPoint(0, 10),
-              IntPoint(constraint.parentRelativeStickyBoxOffset));
+    EXPECT_EQ(FloatPoint(0, 10),
+              FloatPoint(constraint.parentRelativeStickyBoxOffset));
   }
 }
 
 TEST_P(ScrollingCoordinatorTest, touchEventHandler) {
   registerMockedHttpURLLoad("touch-event-handler.html");
   navigateTo(m_baseURL + "touch-event-handler.html");
   forceFullCompositingUpdate();
 
   ASSERT_EQ(WebEventListenerProperties::Blocking,
             webLayerTreeView()->eventListenerProperties(
@@ skipping 702 matching lines @@
             MainThreadScrollingReason::kHasOpacityAndLCDText |
                 MainThreadScrollingReason::kHasBorderRadius);
 }
 
 TEST_P(StyleRelatedMainThreadScrollingReasonTest, BoxShadowTest) {
   testStyle("box-shadow",
             MainThreadScrollingReason::kHasBoxShadowFromNonRootLayer);
 }
 
 }  // namespace blink