CSS Transforms: Implement transform-style

Source/core/css/CSSComputedStyleDeclaration.cpp

Index: Source/core/css/CSSComputedStyleDeclaration.cpp
diff --git a/Source/core/css/CSSComputedStyleDeclaration.cpp b/Source/core/css/CSSComputedStyleDeclaration.cpp
index 328f16e993ef2ebd1fe13002e74d8d2c78bed9a1..44e965c3d2823c8baee239cddd41fc43f6006933 100644
--- a/Source/core/css/CSSComputedStyleDeclaration.cpp
+++ b/Source/core/css/CSSComputedStyleDeclaration.cpp
@@ -318,6 +318,7 @@ static const CSSPropertyID staticComputableProperties[] = {
     CSSPropertyWebkitTextStrokeWidth,
     CSSPropertyWebkitTransform,
     CSSPropertyWebkitTransformOrigin,
+    CSSPropertyTransformStyle,
     CSSPropertyWebkitTransformStyle,
     CSSPropertyWebkitTransitionDelay,
     CSSPropertyWebkitTransitionDuration,
@@ -2575,6 +2576,7 @@ PassRefPtrWillBeRawPtr<CSSValue> CSSComputedStyleDeclaration::getPropertyCSSValu
             }
             return list.release();
         }
+        case CSSPropertyTransformStyle:
         case CSSPropertyWebkitTransformStyle:
             return cssValuePool().createIdentifierValue((style->transformStyle3D() == TransformStyle3DPreserve3D) ? CSSValuePreserve3d : CSSValueFlat);
         case CSSPropertyTransitionDelay:
@@ -2774,7 +2776,6 @@ PassRefPtrWillBeRawPtr<CSSValue> CSSComputedStyleDeclaration::getPropertyCSSValu
         case CSSPropertyPerspectiveOrigin:
         case CSSPropertyTransform:
         case CSSPropertyTransformOrigin:
-        case CSSPropertyTransformStyle:
             ASSERT_NOT_REACHED();
             break;