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

Source/bindings/core/v8/V8Binding.cpp

Index: Source/bindings/core/v8/V8Binding.cpp
diff --git a/Source/bindings/core/v8/V8Binding.cpp b/Source/bindings/core/v8/V8Binding.cpp
index 9d52428fd65061187f4d4bac23574645fca3a314..38112e38fa7126b5985f4a00a46d03817f6c3125 100644
--- a/Source/bindings/core/v8/V8Binding.cpp
+++ b/Source/bindings/core/v8/V8Binding.cpp
@@ -1055,6 +1055,43 @@ PassRefPtr<TraceEvent::ConvertableToTraceFormat> devToolsTraceEventData(v8::Isol
     return InspectorFunctionCallEvent::data(context, info.scriptId(), info.resourceName(), info.lineNumber());
 }
 
+bool AttributesWithObservableSideEffectOnGet::hasNoSideEffect(v8::Isolate* isolate, v8::Handle<v8::Value> domObject, v8::Handle<v8::Value> attributeName)
+{
+    if (!V8DOMWrapper::isWrapper(isolate, domObject))
+        return false;
+    const WrapperTypeInfo* wrapperTypeInfo =
+        toWrapperTypeInfo(v8::Handle<v8::Object>::Cast(domObject));
+
+    if (attributeName.IsEmpty() || !attributeName->IsString())
+        return false;
+    String attribute = V8StringResource<>(attributeName);
+
+    if (!wrapperTypeInfo || attribute.isEmpty())
+        return false;
+
+    for (const auto& entry : *attributesWithSideEffectOnGet()) {
+        if (wrapperTypeInfo->isSubclass(entry.first)
+            && attribute == entry.second)
+            return false;
+    }
+
+    return true;
+}
+
+void AttributesWithObservableSideEffectOnGet::add(const WrapperTypeInfo* wrapperTypeInfo, String attributeName)
+{
+    AttributeSet* attributes = attributesWithSideEffectOnGet();
+    AttributeSet::ValueType value(wrapperTypeInfo, attributeName);
+    if (!attributes->contains(value))
+        attributes->append(value);
+}
+
+AttributesWithObservableSideEffectOnGet::AttributeSet* AttributesWithObservableSideEffectOnGet::attributesWithSideEffectOnGet()
+{
+    DEFINE_STATIC_LOCAL(AttributeSet, attributes, ());
+    return &attributes;
+}
+
 void v8ConstructorAttributeGetterAsProperty(v8::Local<v8::String> propertyName, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8ConstructorAttributeGetter(info);