Support animating CSS property "order"

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

Index: third_party/WebKit/Source/core/css/resolver/AnimatedStyleBuilder.cpp
diff --git a/third_party/WebKit/Source/core/css/resolver/AnimatedStyleBuilder.cpp b/third_party/WebKit/Source/core/css/resolver/AnimatedStyleBuilder.cpp
index f49bf4de73705922da2811000be073faaeaed2dc..5501d85711565728aaa27bedf0ffdce1dc2dfb32 100644
--- a/third_party/WebKit/Source/core/css/resolver/AnimatedStyleBuilder.cpp
+++ b/third_party/WebKit/Source/core/css/resolver/AnimatedStyleBuilder.cpp
@@ -549,6 +549,10 @@ void AnimatedStyleBuilder::applyProperty(CSSPropertyID property,
       style->setOpacity(clampTo<float>(toAnimatableDouble(value)->toDouble(), 0,
                                        nextafterf(1, 0)));
       return;
+    case CSSPropertyOrder:
+      style->setOrder(
+          clampTo<int>(round(toAnimatableDouble(value)->toDouble())));
+      return;
     case CSSPropertyOrphans:
       style->setOrphans(
           clampTo<short>(round(toAnimatableDouble(value)->toDouble()), 1));