Improve CSS Style matching spec compliance

Source/web/PopupMenuImpl.cpp

 // Copyright (c) 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 "web/PopupMenuImpl.h"
 
 #include "core/HTMLNames.h"
 #include "core/css/CSSFontSelector.h"
 #include "core/dom/ElementTraversal.h"
@@ skipping 50 matching lines @@
     switch (variant) {
     case FontVariantNormal:
         return "normal";
     case FontVariantSmallCaps:
         return "small-caps";
     }
     ASSERT_NOT_REACHED();
     return nullptr;
 }
 
+// TODO crbug.com/516675 Add stretch to serialization
+
 const char* fontStyleToString(FontStyle style)
 {
     switch (style) {
     case FontStyleNormal:
         return "normal";
+    case FontStyleOblique:
+        return "oblique";
     case FontStyleItalic:
         return "italic";
     }
     ASSERT_NOT_REACHED();
     return nullptr;
 }
 
 const char* textTransformToString(ETextTransform transform)
 {
     switch (transform) {
@@ skipping 426 matching lines @@
 
 void PopupMenuImpl::disconnectClient()
 {
     m_ownerElement = nullptr;
     // Cannot be done during finalization, so instead done when the
     // layout object is destroyed and disconnected.
     dispose();
 }
 
 } // namespace blink