Fix the bug that negative outline-offset is covered up by composited

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

Index: third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp b/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp
index 0ec8c4584000d27cb667b14415a2d1128bae592a..e07e5e6d36fb28266a6e6a20fe502e127f4852c7 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp
@@ -112,12 +112,6 @@ bool LayoutBoxModelObject::usesCompositedScrolling() const {
 }
 
 bool LayoutBoxModelObject::hasLocalEquivalentBackground() const {
-  int minBorderWidth = std::min(
-      style()->borderTopWidth(),
-      std::min(
-          style()->borderLeftWidth(),
-          std::min(style()->borderRightWidth(), style()->borderBottomWidth())));
-  bool outlineOverlapsPaddingBox = style()->outlineOffset() < -minBorderWidth;
   bool hasCustomScrollbars = false;
   // TODO(flackr): Detect opaque custom scrollbars which would cover up a
   // border-box background.
@@ -146,15 +140,6 @@ bool LayoutBoxModelObject::hasLocalEquivalentBackground() const {
     if (layer->attachment() == LocalBackgroundAttachment)
       continue;
 
-    // If the outline draws inside the border, it intends to draw on top of the
-    // scroller's background, however because it is painted into a layer behind
-    // the scrolling contents layer we avoid auto promoting in this case to
-    // avoid obscuring the outline.
-    // TODO(flackr): Outlines should be drawn on top of the scrolling contents
-    // layer so that they cannot be covered up by composited scrolling contents.
-    if (outlineOverlapsPaddingBox)
-      return false;
-
     // Solid color layers with an effective background clip of the padding box
     // can be treated as local.
     if (!layer->image() && !layer->next() &&