[SPv2] Paint accelerated canvases as foreign layers.

third_party/WebKit/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 "platform/graphics/paint/DisplayItem.h"
 
 namespace blink {
 
 struct SameSizeAsDisplayItem {
     virtual ~SameSizeAsDisplayItem() { } // Allocate vtable pointer.
@@ skipping 113 matching lines @@
 
 static WTF::String drawingTypeAsDebugString(DisplayItem::Type type)
 {
     PAINT_PHASE_BASED_DEBUG_STRINGS(Drawing);
     return "Drawing" + specialDrawingTypeAsDebugString(type);
 }
 
 static String foreignLayerTypeAsDebugString(DisplayItem::Type type)
 {
     switch (type) {
+        DEBUG_STRING_CASE(ForeignLayerCanvas);
         DEBUG_STRING_CASE(ForeignLayerPlugin);
         DEBUG_STRING_CASE(ForeignLayerVideo);
         DEFAULT_CASE;
     }
 }
 
 static WTF::String clipTypeAsDebugString(DisplayItem::Type type)
 {
     PAINT_PHASE_BASED_DEBUG_STRINGS(ClipBox);
     PAINT_PHASE_BASED_DEBUG_STRINGS(ClipColumnBounds);
@@ skipping 111 matching lines @@
     stringBuilder.append("\", type: \"");
     stringBuilder.append(typeAsDebugString(getType()));
     stringBuilder.append('"');
     if (m_skippedCache)
         stringBuilder.append(", skippedCache: true");
 }
 
 #endif
 
 } // namespace blink