Add parsing support for display: contents, and minimum behavior similar to display: none

third_party/WebKit/Source/core/css/resolver/StyleAdjuster.cpp

Index: third_party/WebKit/Source/core/css/resolver/StyleAdjuster.cpp
diff --git a/third_party/WebKit/Source/core/css/resolver/StyleAdjuster.cpp b/third_party/WebKit/Source/core/css/resolver/StyleAdjuster.cpp
index 74dda2f08ca881ceefd5a07b98ea1e4a8a47194a..c2dfde0609a0f1e5b40695b6cc498bca10869194 100644
--- a/third_party/WebKit/Source/core/css/resolver/StyleAdjuster.cpp
+++ b/third_party/WebKit/Source/core/css/resolver/StyleAdjuster.cpp
@@ -85,8 +85,9 @@ static EDisplay equivalentBlockDisplay(EDisplay display) {
     case EDisplay::TableCaption:
       return EDisplay::Block;
     case EDisplay::None:
+    case EDisplay::Contents:
       ASSERT_NOT_REACHED();
-      return EDisplay::None;
+      return display;
   }
   ASSERT_NOT_REACHED();
   return EDisplay::Block;
@@ -369,7 +370,8 @@ static void adjustStyleForDisplay(ComputedStyle& style,
 void StyleAdjuster::adjustComputedStyle(ComputedStyle& style,
                                         const ComputedStyle& parentStyle,
                                         Element* element) {
-  if (style.display() != EDisplay::None) {
+  if (style.display() != EDisplay::None &&
+      style.display() != EDisplay::Contents) {
     if (element && element->isHTMLElement())
       adjustStyleForHTMLElement(style, toHTMLElement(*element));