[Typed OM] Add an "UnsupportedStyleValue" in C++ that just has a string for unknown types

third_party/WebKit/Source/core/css/cssom/StyleValueFactory.cpp

Index: third_party/WebKit/Source/core/css/cssom/StyleValueFactory.cpp
diff --git a/third_party/WebKit/Source/core/css/cssom/StyleValueFactory.cpp b/third_party/WebKit/Source/core/css/cssom/StyleValueFactory.cpp
index f8892f1e077e9503bdc53d7b1d67a7bbaa7426aa..a1d12b01c668d0f825477f9cc6efbb28d16c0b3c 100644
--- a/third_party/WebKit/Source/core/css/cssom/StyleValueFactory.cpp
+++ b/third_party/WebKit/Source/core/css/cssom/StyleValueFactory.cpp
@@ -7,6 +7,7 @@
 #include "core/css/CSSValue.h"
 #include "core/css/cssom/CSSSimpleLength.h"
 #include "core/css/cssom/CSSStyleValue.h"
+#include "core/css/cssom/CSSUnsupportedStyleValue.h"
 
 namespace blink {
 
@@ -22,6 +23,7 @@ CSSStyleValueVector StyleValueFactory::cssValueToStyleValueVector(CSSPropertyID
         }
     }
     // TODO(meade): Implement the rest.
+    styleValueVector.append(CSSUnsupportedStyleValue::create(value.cssText()));
     return styleValueVector;
 }