[CSS Exclusions] Add CSS parsing support for image URI shape-inside and shape-outside values

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 474c08442c1adfff7c3a03a2874bbfed574fbe43..4fc0fc5eb0af68b411368978d8741df06c0adade 100644
--- a/Source/core/css/CSSComputedStyleDeclaration.cpp
+++ b/Source/core/css/CSSComputedStyleDeclaration.cpp
@@ -2591,14 +2591,24 @@ PassRefPtr<CSSValue> CSSComputedStyleDeclaration::getPropertyCSSValue(CSSPropert
         case CSSPropertyWebkitShapeInside:
             if (!style->shapeInside())
                 return cssValuePool().createIdentifierValue(CSSValueAuto);
-            else if (style->shapeInside()->type() == ExclusionShapeValue::OUTSIDE)
+            if (style->shapeInside()->type() == ExclusionShapeValue::Outside)
                 return cssValuePool().createIdentifierValue(CSSValueOutsideShape);
-            ASSERT(style->shapeInside()->type() == ExclusionShapeValue::SHAPE);
+            if (style->shapeInside()->type() == ExclusionShapeValue::Image) {
+                if (style->shapeInside()->image())
+                    return style->shapeInside()->image()->cssValue();
+                return cssValuePool().createIdentifierValue(CSSValueNone);
+            }
+            ASSERT(style->shapeInside()->type() == ExclusionShapeValue::Shape);
             return valueForBasicShape(style->shapeInside()->shape());
         case CSSPropertyWebkitShapeOutside:
             if (!style->shapeOutside())
                 return cssValuePool().createIdentifierValue(CSSValueAuto);
-            ASSERT(style->shapeOutside()->type() == ExclusionShapeValue::SHAPE);
+            if (style->shapeOutside()->type() == ExclusionShapeValue::Image) {
+                if (style->shapeOutside()->image())
+                    return style->shapeOutside()->image()->cssValue();
+                return cssValuePool().createIdentifierValue(CSSValueNone);
+            }
+            ASSERT(style->shapeOutside()->type() == ExclusionShapeValue::Shape);
             return valueForBasicShape(style->shapeOutside()->shape());
         case CSSPropertyWebkitWrapThrough:
             return cssValuePool().createValue(style->wrapThrough());