[RLS] Don't add to ScrollableAreaSet if the size is zero

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

Index: third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
index 1e3aafb6e03cae74c2bad5c6cde268110f629527..b424614b8dc8245abd069b51d02ec88045a440ad 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
@@ -1015,10 +1015,16 @@ bool PaintLayerScrollableArea::HasVerticalOverflow() const {
 }
 
 bool PaintLayerScrollableArea::HasScrollableHorizontalOverflow() const {
+  if (Box().Size().IsZero())

[skobes, 2017/07/15 00:44:31]

Actually it would be simpler to put this logic inside UpdateScrollableAreaSet,
and remove the has_overflow param.  Then the methods
HasScrollableHorizontalOverflow and HasScrollableVerticalOverflow can be deleted
since they are not used elsewhere.

[Srirama, 2017/07/17 14:35:24]

Done.

+    return false;
+
   return HasHorizontalOverflow() && Box().ScrollsOverflowX();
 }
 
 bool PaintLayerScrollableArea::HasScrollableVerticalOverflow() const {
+  if (Box().Size().IsZero())
+    return false;
+
   return HasVerticalOverflow() && Box().ScrollsOverflowY();
 }