Always anchor to top of the anchor element

third_party/WebKit/Source/core/layout/ScrollAnchor.cpp

Index: third_party/WebKit/Source/core/layout/ScrollAnchor.cpp
diff --git a/third_party/WebKit/Source/core/layout/ScrollAnchor.cpp b/third_party/WebKit/Source/core/layout/ScrollAnchor.cpp
index 2d805f19d6f25979023b1f490169cb57cc4a0e4d..accc85d8707bf976fa10bb76cf973c2ec137fa69 100644
--- a/third_party/WebKit/Source/core/layout/ScrollAnchor.cpp
+++ b/third_party/WebKit/Source/core/layout/ScrollAnchor.cpp
@@ -48,16 +48,12 @@ static LayoutBoxItem scrollerLayoutBoxItem(const ScrollableArea* scroller)
     return box;
 }
 
-static Corner cornerFromCandidateRect(LayoutRect candidateRect, LayoutRect visibleRect)
+static Corner cornerFromCandidateRect(const LayoutObject* layoutObject)
 {
-    if (visibleRect.contains(candidateRect.minXMinYCorner()))
-        return Corner::TopLeft;
-    if (visibleRect.contains(candidateRect.maxXMinYCorner()))
+    ASSERT(layoutObject);
+    if (layoutObject->style()->isFlippedBlocksWritingMode()
+        || !layoutObject->style()->isLeftToRightDirection())
         return Corner::TopRight;
-    if (visibleRect.contains(candidateRect.minXMaxYCorner()))
-        return Corner::BottomLeft;
-    if (visibleRect.contains(candidateRect.maxXMaxYCorner()))
-        return Corner::BottomRight;
     return Corner::TopLeft;
 }
 
@@ -66,8 +62,6 @@ static LayoutPoint cornerPointOfRect(LayoutRect rect, Corner whichCorner)
     switch (whichCorner) {
     case Corner::TopLeft: return rect.minXMinYCorner();
     case Corner::TopRight: return rect.maxXMinYCorner();
-    case Corner::BottomLeft: return rect.minXMaxYCorner();
-    case Corner::BottomRight: return rect.maxXMaxYCorner();
     }
     ASSERT_NOT_REACHED();
     return LayoutPoint();
@@ -127,7 +121,7 @@ ScrollAnchor::ExamineResult ScrollAnchor::examine(const LayoutObject* candidate)
     if (occupiesSpace && visibleRect.intersects(candidateRect)) {
         return ExamineResult(
             visibleRect.contains(candidateRect) ? Return : Constrain,
-            cornerFromCandidateRect(candidateRect, visibleRect));
+            cornerFromCandidateRect(candidate));
     } else {
         return ExamineResult(Skip);
     }