Fix Slimming Paint WebGL printing

Source/platform/graphics/paint/DisplayItemListContextRecorder.h

Index: Source/platform/graphics/paint/DisplayItemListContextRecorder.h
diff --git a/Source/platform/graphics/paint/DisplayItemListContextRecorder.h b/Source/platform/graphics/paint/DisplayItemListContextRecorder.h
index b2a68a249824600666ee9c3ec6dfb5fb33de60ab..a61a62090d36e5af045bb1e638cd3fef9ac5458b 100644
--- a/Source/platform/graphics/paint/DisplayItemListContextRecorder.h
+++ b/Source/platform/graphics/paint/DisplayItemListContextRecorder.h
@@ -25,6 +25,8 @@ public:
         m_displayItemList = DisplayItemList::create();
         m_displayItemListContext = adoptPtr(new GraphicsContext(m_displayItemList.get(),
             context.contextDisabled() ? GraphicsContext::FullyDisabled : GraphicsContext::NothingDisabled));
+        m_displayItemListContext->setDeviceScaleFactor(context.deviceScaleFactor());
+        m_displayItemListContext->setPrinting(context.printing());
     }
 
     ~DisplayItemListContextRecorder()