[Slimming Paint] Paint the inspector overlay with GraphicsLayer DisplayList.

Source/platform/graphics/paint/DisplayItem.cpp

Index: Source/platform/graphics/paint/DisplayItem.cpp
diff --git a/Source/platform/graphics/paint/DisplayItem.cpp b/Source/platform/graphics/paint/DisplayItem.cpp
index 9f482fd2d6cdae24f891077fcf44354c43793826..f1c5270ea13fa72360324a21ef31c5490015af40 100644
--- a/Source/platform/graphics/paint/DisplayItem.cpp
+++ b/Source/platform/graphics/paint/DisplayItem.cpp
@@ -44,8 +44,10 @@ static WTF::String drawingTypeAsDebugString(DisplayItem::Type type)
     case DisplayItem::BoxDecorationBackground: return "DrawingBoxDecorationBackground";
     case DisplayItem::Caret: return "DrawingCaret";
     case DisplayItem::ColumnRules: return "DrawingColumnRules";
+    case DisplayItem::DebugRedFill: return "DrawingDebugRedFill";
     case DisplayItem::DragImage: return "DrawingDragImage";
     case DisplayItem::LinkHighlight: return "DrawingLinkHighlight";
+    case DisplayItem::PageOverlay: return "PageOverlay";
     case DisplayItem::PageWidgetDelegateBackgroundFallback: return "DrawingPageWidgetDelegateBackgroundFallback";
     case DisplayItem::Resizer: return "DrawingResizer";
     case DisplayItem::SVGFilter: return "DrawingSVGFilter";
@@ -55,7 +57,6 @@ static WTF::String drawingTypeAsDebugString(DisplayItem::Type type)
     case DisplayItem::ScrollbarVertical: return "DrawingScrollbarVertical";
     case DisplayItem::VideoBitmap: return "DrawingVideoBitmap";
     case DisplayItem::ViewBackground: return "DrawingViewBackground";
-    case DisplayItem::DebugRedFill: return "DrawingDebugRedFill";
     default:
         ASSERT_NOT_REACHED();
         return "Unknown";