Rename DisplayItem::Type enum constants to Chromium style.

third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp

Index: third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp b/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
index 21e0fb14f6ea0e08210f54e3bae4dc76a09dd118..535e0b8df3925bc173501c89ee780ae522d04034 100644
--- a/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
+++ b/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
@@ -386,7 +386,7 @@ void GraphicsLayer::notifyFirstPaintToClient()
         DisplayItemList& itemList = m_paintController->newDisplayItemList();
         for (DisplayItem& item : itemList) {
             DisplayItem::Type type = item.getType();
-            if (DisplayItem::isDrawingType(type) && type != DisplayItem::DocumentBackground && static_cast<const DrawingDisplayItem&>(item).picture()) {
+            if (DisplayItem::isDrawingType(type) && type != DisplayItem::kDocumentBackground && static_cast<const DrawingDisplayItem&>(item).picture()) {
                 m_painted = true;
                 isFirstPaint = true;
                 break;