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

Source/platform/graphics/paint/DisplayItem.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "platform/graphics/paint/DisplayItem.h"
 
 namespace blink {
 
 #ifndef NDEBUG
@@ skipping 38 matching lines @@
     case DisplayItem::PageWidgetDelegateBackgroundFallback: return "DrawingPageWidgetDelegateBackgroundFallback";
     case DisplayItem::Resizer: return "DrawingResizer";
     case DisplayItem::SVGFilter: return "DrawingSVGFilter";
     case DisplayItem::ScrollbarCorner: return "DrawingScrollbarCorner";
     case DisplayItem::ScrollbarHorizontal: return "DrawingScrollbarHorizontal";
     case DisplayItem::ScrollbarTickMark: return "DrawingScrollbarTickMark";
     case DisplayItem::ScrollbarVertical: return "DrawingScrollbarVertical";
     case DisplayItem::VideoBitmap: return "DrawingVideoBitmap";
     case DisplayItem::ViewBackground: return "DrawingViewBackground";
     case DisplayItem::DebugRedFill: return "DrawingDebugRedFill";
+    case DisplayItem::PageOverlay: return "PageOverlay";
     default:
         ASSERT_NOT_REACHED();
         return "Unknown";
     }
 }
 
 static WTF::String clipTypeAsDebugString(DisplayItem::Type type)
 {
     PAINT_PHASE_BASED_DEBUG_STRINGS(ClipBox);
     PAINT_PHASE_BASED_DEBUG_STRINGS(ClipColumnBounds);
@@ skipping 75 matching lines @@
     stringBuilder.append("type: \"");
     stringBuilder.append(typeAsDebugString(type()));
     stringBuilder.append('"');
     if (m_id.scopeContainer)
         stringBuilder.append(String::format(", scope: \"%p,%d\"", m_id.scopeContainer, m_id.scopeId));
 }
 
 #endif
 
 } // namespace blink