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

Source/platform/graphics/paint/DisplayItem.h

 // 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.
 
 #ifndef DisplayItem_h
 #define DisplayItem_h
 
 #include "platform/PlatformExport.h"
 #include "platform/graphics/paint/DisplayItemClient.h"
 #include "wtf/Assertions.h"
@@ skipping 52 matching lines @@
         PageWidgetDelegateBackgroundFallback,
         Resizer,
         SVGFilter,
         ScrollbarCorner,
         ScrollbarHorizontal,
         ScrollbarTickMark,
         ScrollbarVertical,
         VideoBitmap,
         ViewBackground,
         DebugRedFill,
-        DrawingLast = DebugRedFill,
+        PageOverlay,
+        DrawingLast = PageOverlay,

[Xianzhu, 2015/02/09 17:57:10]

Please keep the above list sorted.

[jbroman, 2015/02/09 18:13:36]

Ah, I hadn't realized it was sorted (I saw D, B, C and assumed it was
order-of-creation). Fixed.

 
         CachedFirst,
         CachedLast = CachedFirst + DrawingLast - DrawingFirst,
 
         ClipFirst,
         ClipBoxPaintPhaseFirst = ClipFirst,
         ClipBoxPaintPhaseLast = ClipBoxPaintPhaseFirst + PaintPhaseMax,
         ClipColumnBoundsPaintPhaseFirst,
         ClipColumnBoundsPaintPhaseLast = ClipColumnBoundsPaintPhaseFirst + PaintPhaseMax,
         ClipLayerFragmentPaintPhaseFirst,
@@ skipping 189 matching lines @@
     virtual bool isEndAndPairedWith(const DisplayItem& other) const override = 0;
 #endif
 
 private:
     virtual bool isEnd() const override final { return true; }
 };
 
 } // namespace blink
 
 #endif // DisplayItem_h