bindings,devtools: Shows DOM attributes' values in DevTools.

Source/bindings/core/v8/V8DOMWrapper.cpp

Index: Source/bindings/core/v8/V8DOMWrapper.cpp
diff --git a/Source/bindings/core/v8/V8DOMWrapper.cpp b/Source/bindings/core/v8/V8DOMWrapper.cpp
index e34525fca9139d218d5883e383c15dfe7eee6222..12f9722022ebf7e501327091abd858ab41a2f800 100644
--- a/Source/bindings/core/v8/V8DOMWrapper.cpp
+++ b/Source/bindings/core/v8/V8DOMWrapper.cpp
@@ -93,6 +93,8 @@ bool V8DOMWrapper::isWrapper(v8::Isolate* isolate, v8::Local<v8::Value> value)
 
     const WrapperTypeInfo* untrustedWrapperTypeInfo = toWrapperTypeInfo(object);
     V8PerIsolateData* perIsolateData = V8PerIsolateData::from(isolate);
+    if (!(untrustedWrapperTypeInfo && perIsolateData))
+        return false;
     return perIsolateData->hasInstance(untrustedWrapperTypeInfo, object);
 }