Provide a CSSParserContext to CSSSyntaxDescriptor

third_party/WebKit/Source/core/css/PropertyRegistration.cpp

Index: third_party/WebKit/Source/core/css/PropertyRegistration.cpp
diff --git a/third_party/WebKit/Source/core/css/PropertyRegistration.cpp b/third_party/WebKit/Source/core/css/PropertyRegistration.cpp
index ed25ec77536f94dced75c8e13c3f68c4ab15d0a5..c0d18570d0dab2d2a2d1d4bc9e909cd959a67bed 100644
--- a/third_party/WebKit/Source/core/css/PropertyRegistration.cpp
+++ b/third_party/WebKit/Source/core/css/PropertyRegistration.cpp
@@ -10,6 +10,7 @@
 #include "core/css/CSSVariableReferenceValue.h"
 #include "core/css/PropertyDescriptor.h"
 #include "core/css/PropertyRegistry.h"
+#include "core/css/parser/CSSParserContext.h"
 #include "core/css/parser/CSSTokenizer.h"
 #include "core/css/parser/CSSVariableParser.h"
 #include "core/dom/Document.h"
@@ -107,8 +108,8 @@ void PropertyRegistration::registerProperty(
   if (descriptor.hasInitialValue()) {
     CSSTokenizer tokenizer(descriptor.initialValue());
     bool isAnimationTainted = false;
-    const CSSValue* initial =
-        syntaxDescriptor.parse(tokenizer.tokenRange(), isAnimationTainted);
+    const CSSValue* initial = syntaxDescriptor.parse(
+        tokenizer.tokenRange(), strictCSSParserContext(), isAnimationTainted);

[Timothy Loh, 2017/01/16 00:33:36]

This is probably not right, I think we need a proper context here to let you
register a property with an initialValue of (e.g.) url(relative.png) and have it
work? Maybe document->elementSheet().contents()->parserContext() would work?

[fs, 2017/01/16 13:18:01]

Thanks, fixed.

     if (!initial) {
       exceptionState.throwDOMException(
           SyntaxError,