Add DisplayItemList::newDisplayItems() and cleanup tests

Source/platform/graphics/paint/DrawingRecorder.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/DrawingRecorder.h"
 
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/GraphicsLayer.h"
@@ skipping 19 matching lines @@
 
     context.displayItemList()->createAndAppend<CachedDisplayItem>(client, DisplayItem::drawingTypeToCachedDrawingType(type));
     return true;
 }
 
 DrawingRecorder::DrawingRecorder(GraphicsContext& context, const DisplayItemClientWrapper& displayItemClient, DisplayItem::Type displayItemType, const FloatRect& cullRect)
     : m_context(context)
     , m_displayItemClient(displayItemClient)
     , m_displayItemType(displayItemType)
 #if ENABLE(ASSERT)
-    , m_displayItemPosition(RuntimeEnabledFeatures::slimmingPaintEnabled() ? m_context.displayItemList()->newDisplayItemsSize() : 0)
+    , m_displayItemPosition(RuntimeEnabledFeatures::slimmingPaintEnabled() ? m_context.displayItemList()->newDisplayItems().size() : 0)
     , m_underInvalidationCheckingMode(DrawingDisplayItem::CheckPicture)
 #endif
 {
     if (!RuntimeEnabledFeatures::slimmingPaintEnabled())
         return;
 
     ASSERT(context.displayItemList());
     if (context.displayItemList()->displayItemConstructionIsDisabled())
         return;
 
@@ skipping 33 matching lines @@
 
     ASSERT(m_context.displayItemList());
     if (m_context.displayItemList()->displayItemConstructionIsDisabled())
         return;
 
 #if ENABLE(ASSERT)
     if (RuntimeEnabledFeatures::slimmingPaintStrictCullRectClippingEnabled())
         m_context.restore();
 
     m_context.setInDrawingRecorder(false);
-    ASSERT(m_displayItemPosition == m_context.displayItemList()->newDisplayItemsSize());
+    ASSERT(m_displayItemPosition == m_context.displayItemList()->newDisplayItems().size());
 #endif
 
     m_context.displayItemList()->createAndAppend<DrawingDisplayItem>(m_displayItemClient
         , m_displayItemType
         , m_context.endRecording()
 #if ENABLE(ASSERT)
         , m_underInvalidationCheckingMode
 #endif
         );
 }
 
 } // namespace blink