Include the interface name when an uncloneable DOM wrapper is encountered.

This has been useful in my debugging, and could be useful to authors as well.

BUG=148757

Review-Url: https://codereview.chromium.org/2354873006
Cr-Commit-Position: refs/heads/master@{#419948}

third_party/WebKit/Source/bindings/core/v8/serialization/V8ScriptValueSerializer.cpp

@@ -129,8 +129,10 @@ v8::Maybe<bool> V8ScriptValueSerializer::WriteHostObject(v8::Isolate* isolate, v
         DCHECK(!exceptionState.hadException());
         return v8::Just(true);
     }
-    if (!exceptionState.hadException())
-        exceptionState.throwDOMException(DataCloneError, "An object could not be cloned.");
+    if (!exceptionState.hadException()) {
+        String interface = wrappable->wrapperTypeInfo()->interfaceName;
+        exceptionState.throwDOMException(DataCloneError, interface + " object could not be cloned.");
+    }
     return v8::Nothing<bool>();
 }