Unify the calculation of main thread offset of sticky element

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 356 matching lines @@
     EXPECT_TRUE(constraint.is_anchored_top && constraint.is_anchored_left &&
                 !constraint.is_anchored_right &&
                 !constraint.is_anchored_bottom);
     EXPECT_EQ(1.f, constraint.top_offset);
     EXPECT_EQ(1.f, constraint.left_offset);
     EXPECT_EQ(IntRect(100, 100, 10, 10),
               IntRect(constraint.scroll_container_relative_sticky_box_rect));
     EXPECT_EQ(
         IntRect(100, 100, 200, 200),
         IntRect(constraint.scroll_container_relative_containing_block_rect));
-    EXPECT_EQ(IntPoint(100, 100),
-              IntPoint(constraint.parent_relative_sticky_box_offset));
   }
   {
     Element* element = document->getElementById("div-tr");
     ASSERT_TRUE(element);
     WebLayer* layer = WebLayerFromElement(element);
     ASSERT_TRUE(layer);
     WebLayerStickyPositionConstraint constraint =
         layer->StickyPositionConstraint();
     ASSERT_TRUE(constraint.is_sticky);
     EXPECT_TRUE(constraint.is_anchored_top && !constraint.is_anchored_left &&
@@ skipping 55 matching lines @@
     ASSERT_TRUE(layer);
     WebLayerStickyPositionConstraint constraint =
         layer->StickyPositionConstraint();
     ASSERT_TRUE(constraint.is_sticky);
     EXPECT_TRUE(constraint.is_anchored_top);
     EXPECT_EQ(IntRect(100, 110, 10, 10),
               IntRect(constraint.scroll_container_relative_sticky_box_rect));
     EXPECT_EQ(
         IntRect(100, 100, 200, 200),
         IntRect(constraint.scroll_container_relative_containing_block_rect));
-    EXPECT_EQ(IntPoint(0, 10),
-              IntPoint(constraint.parent_relative_sticky_box_offset));
   }
 }
 
 TEST_P(ScrollingCoordinatorTest, touchEventHandler) {
   RegisterMockedHttpURLLoad("touch-event-handler.html");
   NavigateTo(base_url_ + "touch-event-handler.html");
   ForceFullCompositingUpdate();
 
   ASSERT_EQ(WebEventListenerProperties::kBlocking,
             GetWebLayerTreeView()->EventListenerProperties(
@@ skipping 795 matching lines @@
   ForceFullCompositingUpdate();
   PaintLayerScrollableArea* scrollable_area2 =
       ToLayoutBoxModelObject(container2->GetLayoutObject())
           ->GetScrollableArea();
   ASSERT_TRUE(scrollable_area2);
   EXPECT_TRUE(scrollable_area2->GetNonCompositedMainThreadScrollingReasons() &
               MainThreadScrollingReason::kHasBorderRadius);
 }
 
 }  // namespace blink